excuses be gone.
I wish you could get what you want.
You seem to have lots of awareness of what is keeping you stuck.
Imagination of what you want is part of the idea of going for something new. If you can imagine that it's possible, then it's more available to get into. But if it's over run by excuses, the imagination of what could be is really just a ball of "I can't" statements.
Another part is letting go of everything that is keeping you stuck, all the excuses, all the but this and that or statements of being ADD. All that is habitual needless churning. I know I do it too at times. To let go you need to know it's there and not be ruled by it.
If you want something else you have to imagine what that is and just bow to the old stuff as whatever. Keep from engaging excuses, in other words. Only to be aware of them and take a bow at them as something that you created in your life that probably was needed at sometime. But now you can just focus on how you would like it to go going forward.
If an excuse shows up that stopped you from picking up the guitar - just mentally look at the excuse and take a bow at it and then imagine or even pick up the guitar. If you don't feel passion to practice, so what? That's an excuse. If it's something you'd rather be doing than just spinning out excuses for not wanting to do what you want to do - then go ahead and do this new thing you want to do. And don't tell me you don't know what you want. That is a favorite excuse of mine - you can't have that one!
It could be simple. It could there's no need to figure out a bunch of techniques and do the best IM you can. It almost seems like you need something that is simpler instead of more stuff to do. It could be more natural. It's possible. Just let go of the objections to what comes up when you are going about something new.
Like I wanted to do push ups routine for a while. I had excuses to not do it. I'm tired. I just ate. I'll break a sweat. I already go a workout with yard work. I wasn't into doing them. I started wondering why I wanted to do it. Those were excuses. I did what I suggested here. I noticed these excuses. I mentally bowed at them and said I think I would rather spend 10 minutes actually doing the push ups than entertaining/beefing up all the excuses. It was a decision. I had to choose to not indulge the excuses. Well it lasted a while. I'm full of excuses again of some kind. But it can work and be a easy as a way to focus on a goal. Just nod to the habitual old stuff and do something new.