Ok, this might sound quaint but hear me out: have you tried meditation? Sometimes the struggle is in our head; aiming for something nebulous, trying too hard, thinking of too many things.
Meditation helps me clear the negativity that resides in my head, and allows me to once again approach the machines with the same goal that I had when I bought them: to have fun, enjoy myself, make sounds, make music, explore.
I’ve studied a lot in my few years on this planet, and I can say this much, you learn better when you’re having fun, you learn easiest when you have a specific goal you’re aiming for. Emphasis on “specific”. I read ALL the manuals, trust me, I do, but things settle when I’m trying to solve a specific problem, not an assumed one that I made up. When I’m tackling a problem, I read the manual, and keep on working. I’m not trying to master all of the things, all of the time.
Set specific goals, set aside specific devices, maybe sell some stuff (it feels better than you might think), and don’t bemoan yourself for owning all this stuff.