I love a good long, easy ride but I haven’t found a route near me that lets me comfortably do longer intervals without stop lights/traffic etc.
I got up to 3x40 sweetspot on the trainer back in the beginning of April and I was flying outside. I feel much stronger when my TTE is built out and that’s hard to work on with my terrain.
Another option is to find a good group ride in the area…fresh motivation and riding with others always ups the juices.
I get the concept that people go backwards in fitness once they go outside, but my experience is 100% the opposite. It once I get outside that I really find my legs. But I am also usually doing very fast group rides where I am pushing myself pretty damn hard. We have a fast rotating pace line group on Tues / Thurs AMs where we average well over 25mph with long stretches ~30mph or above. Then on weekends I tend to do long gravel trail rides with buddies where we inevitably put in long SS / Threshold sections.
My best fitness always come later in the summer as a result of these rides and my motivation remains high.
I’ve found that changing what I do during a ride on the trainer can make a world of difference. Watching movies, reading e-books, listening to different genres of music, and mixing it up on custom workouts. But, hell yes, taking a day (or more) off just to ‘get right’. I’ve noticed that if a do a lot of harder riding, and take a day off before an event, I seem to do better and I can step it up higher on more workouts too. It’s like a reset, or a setting in of the previous efforts…
But I was reading e-books, and time flew, and not watching what was coming up was helpful too. More reactive than planned, if that makes sense. Sounds like you are getting burned out a bit. Change it up…
How’s your VO2 Max? My strength is diesel power and my natural tendency is to train to that, but I was surprised how much stronger I got when I did a dedicated VO2 block and progressed into longer (relative to VO2 Max) supra-threshold intervals.
Other than just giving yourself some slack and waiting for your motivation to come back for the indoor stuff, the other option is to mix it up and do a block that’s more aligned to your available terrain. You could see benefits from that regardless, and be less sick of trainer if you want to go back to SST after.
its called FUD, don’t listen to it. If I was you, I would cut back on hours and do some hard efforts outside, preferably in a group, like Power’s suggestion:
I’m taking an early off-season and focused on strength training… barely riding right now:
4 hours/week 
however my fitness is slowly increasing.
@tgarson I haven’t done much VO2 work since Feb…probably a good idea to switch it up!
@WindWarrior @Power13 That’s a great idea about the group rides. I haven’t done too many lately. I seem to be in the gray zone where half the rides I’m familiar with are perhaps a slower pace than I’d prefer, and the other half might be too much 
Might be time to see what other options there are out there.
Maybe you can just float in the middle and hang on? I get bored sitting in the pack, but it definitely reduces the effort needed to stay with the group.
Oh! I’ve recently started focusing on VO2Max efforts myself and it feels much, much better tackling it after spending a lot of time building a solid base with Sweet Spot and Threshold. Diving straight to V02Max before was painful and unfun, but I’m actually enjoying the intensity a lot more now. It’s really nice feeling kinda strong.
cut your hours to increase rest, and focus on the too fast rides. Hang on as long as you can, and there’s your vo2 and intensity work. Focus on soul rides to bring the joy of cycling back, and don’t worry about your fitness (in particular if you do enough rides in the heat).
sounds like you have a good & solid aerobic base, so another way of saying is “time to switch from base to race” and have fun. The race efforts are your “structure” and either lots of full gas with the faster group, or lots of tempo/SS hero pulls for the slower group. Everything else should be easy unless you believe there is a weakness that needs to be worked on 1 day/week.
So do more of the work for those rides…don’t pull harder, just longer. Make them SS intervals and your buddies will probably be more than happy to let you do the work!! Win-Win! 
That’s what I do after getting dropped by the A group - I head to the B group and do all or most of the work at tempo/SS.
While it’s true that we’ve mentioned that athletes may get slower over the summer when stopping structured training, it’s also true that athletes get slower if they burn out from training entirely! Reading your post, it seems like you could use a break from structure – and that’s totally okay. Continuing to ride will still keep you fit, and it’s a far better alternative than burning out and not riding at all!
It sounds like longer efforts might be giving you the most grief. If you’re willing to do some longer intervals outside, are there any stretches of road that might be suitable? Long climbs are certainly preferable for most of us, but most of us don’t live within riding distance from home of epic cols… Personally, I’ve had success doing longer intervals outdoors on roads without many (if any) interruptions/stop signs/traffic lights. Even if the terrain isn’t perfectly flat, it can still serve the right purpose for getting those longer efforts in with cadence adjustments to keep your power in check.
That said, if you only have a few weeks left before taking a mid-season break in July, if you just want to do some unstructured riding for a bit and have some fun with the fitness you’ve built up, I think that’s a solid option as well! As @Power13 and @WindWarrior said, group rides can be a blast if you’re feeling good – and it sounds like you are based on that 2nd-best all-time 1-minute power PR!
In short, feel free to take some time away from structure and do some fun riding outside if that’s what your heart is telling you. I’m from the Northeast originally and I definitely know the struggle of going through hours and hours on the trainer until the good weather finally comes around – and in the Northeast, that period of good weather is much too short, so you should definitely go enjoy it!
Structured workouts will still be there when you’re ready to get back at it again. 
I mean if you are still motivated to ride outside, then just go out and enjoy it, you can still do structured work, if you have shorter hills, du shorter Threshold or supra Threshold work, or VO2 max stile efforts, or just like others said do grouprides. I doubt you loose much if you keep on riding and keep it somewhat reasonable (2 Hard days and rest relatively easy). I had to get out last Friday because I couldn’t stomach another long SS session on the trainer, and just did 10 minute efforts over the climbs we have, still good stimulus and cleared my mind.
Being Fit = Fun
I fixed that for you.
This is what I keep getting stuck on As a former sedentary person, it look alot of effort for me to lose some weight and get fit on the bike. I love doing big rides and challenging myself, but I’ll never be the skinny guy who can go Z2/3 up big climbs. I need a certain level of fitness to do the events I enjoy and it’s a challenge balancing the training to get/stay there.
I appreciate all the tips folks!! 
FTP power doesn’t just go away if you leave it alone for a few weeks. Do some vo2 stuff outside for a month. Trainer sounds boring as hell, especially for the durations you’re doing. That’s next level commitment so don’t give yourself a hard time nor be surprised you’re now sick of it. It’s supposed to be fun, so go outside and make it so
