Let me start zoomed in and then progressively zoom out.
Fueling
If you already feel you are zapped for energy, alarm bells should go off.
First off, you are under fueling to a significant degree. The general recommendation these days is 90–120 g/h. I’d fuel every single workout, even recovery workouts. You don’t need to fuel recovery rides with 120 g/h, but you should take in something. The absolute minimum I’d use is 60–80 g/h, which is a factor of 2 more.
But lack of energy could be a broader problem. Your body fat percentage is very, very low, so I’d look into whether you are taking in enough calories, period. Given with your history of orthorexia, this is definitely something you might want to tackle with a professional.
But to give you one point of anecdata that I have heard from e. g. Chad and Amber is that increasing your weight and body fat percentage might make you stronger. I was at my strongest when I was weighing a few kilos more.
At my lightest, 71.5 kg, my FTP was around 322 W if memory serves, so 4.5 W/kg. During Covid I decided to put on a little weight to make myself a bit more robust against illness and I peaked at 348 W, which corresponded to 4.7 W/kg at 74 kg.
Are you recovering/can you handle your training and your group rides?
Another point is recovery: hard group rides = hard workout, and if you don’t plan that in (or skip them!), then you compromise your training. Training more ≠ becoming faster, that’s only true if you can recover.
Why are you training in the first place? Are you comparing yourself to the right people?
You can find group rides with people that are substantially stronger than you and they will drop you, period. Put another way, you can compare yourself to the best of the best, locally, and fall short.
So maybe take a step back and ask yourself why you are doing all of this training in the first place? In my mind, unless you are having specific race goals, health should be a primary factor. Structured workouts and structured training are doing wonders for my mental health, for example.