Hi. I can't say this will offer much help, but I commonly feel this way. The dread of the areas I should improve. The areas I have the desire to improve. The fatigue stemming from the never ending areas I need improve in, if I'm ever going to feel better. My body and mind are seriously exhausted before I even get started.
While reading your post, 'essentialism' popped up into my head. The idea is about pausing and asking yourself, "Am I investing my energy in the right activities?" Maybe you can look into that.
This is something I'm working on. Even the smallest activities. When I'm mindlessly scrolling social media. When I'm taking an extra lap around a parking lot for a better spot. When I'm googling an extra hour to a save a couple bucks on an item. "Was it smart for me to do that?" Every day shit. I know it adds up to my exhaustion, preventing me from tackling what's important. No way around it.
So the idea is: Only once you give yourself permission to stop trying to do it all, to stop saying yes to everyone and everything your brain cooks up, can you make your highest contribution towards the things that really matter to you. The elimination of the non-essentials.
Only you decide what those are. So make a list for yourself. You don't need to show any body. Write some crazy stuff about what your doing through the day. What brought you closer to feeling your best. What helped, and what didn't help. That way, you can look back before bed and say, damnit I spent 40 min on that useless app, and didn't get to the library in time to get a book, I could of grabbed a book on social skills. Or hell yeah, I took the dog for a walk, and I feel clear headed. I need to mark this down to fit that in again.
I get it, I'm rambling on about small boring topics. walking the dog, driving around a parking lot, ect. But my opinion is, you gotta start somewhere. So be selfish, and cut out things that's no longer working for you. Even if you gotta tell someone no. Give yourself the time and energy to tackle small goals in the short term, so you can free yourself to go after slightly bigger things. And then bigger if you wish. It's not easy.
Also, motivation is shit. Good luck.