Heeey @Eushev24!! Welcome back!!
Amazing! This is certainly on the cards for you again 
MANY (most) of us have been in a situation where we feel like we are starting from scratch. That can happen for a host of reasons; illness, life events, motivation etc. It sounds like this experience has highligthed to you that you value being physicaly fit. So I think the first step in moving forward should be recognising what you can do to prevent this from happening again.
-
Dizziness- have you figured out what was causing the dizziness? If you are confident you are on top of nutrition, hydration aNd cooling strategies, I recommend seeing your doctor to figure out what was causing this.
-
Consistency is key.
Have you considered doing your TrainerRoad workouts outside? Check out this article for more info. This may help maintain your motivation and thus consistency moving forward. As you noticed, structured training is what will make you faster, so finding a way that allows you to do structured training in an enjoyable way is crucial to maintaining progress and improving your fitness.
- We want to find a Traininng Plan that works with your life, especially with the added challenges involved with having a newborn (CONGRATS!!). We recently introduced two and four day Training Plans. You might find that a slightly reduced Training Volume allows you to be more consistent. You can find out more about Plan Builder Version two here: 🎉🎉🎉 Announcement: Personalized Custom Training Plans! 🎉🎉🎉.
A couple of other things I’d like to mention:
-
Start from where you are at. Training has to be specific to your current needs and fitness. Confronting a major loss of fitness SUCKS. But it is a essential to making progress.
-
Use AI FTP detection rather than doing an FTP test. If you have completed 10 TrainerRoad indoor workouts, you can use this feature! You can find out more about AI FTP detection in this article here.
You’ll get back to where you were!! 
Being honest with yourself now will allow you to get back to that fit feeling faster! 