> How do I get back to who I was, in terms of feeling driven to solve problems and make impact? I feel like I’ve lost who I once was and don’t know how to get it back.

This is an interesting statement. I feel the same, but I wonder how much of the optimism and motivation I had in my 20s was unfounded and naive, stemming from a lack of experience. Having seen stuff play out multiple cycles has made me more pessimistic (realistic?) This makes it harder to become motivated, at least about technology. I guess that's a good thing to some extent, but it's also sad that I can't go back to that old naive self who blissfully worked on stuff without questioning. I think you need to deal with the fact that you can't go back to that old self because you have more knowledge that inhibits the naive optimism.

Maybe try something other than technology? How about working out? Playing an instrument? Art?