How would you get back into hobbies you've abandoned for years?

Cooking is something that fulfills a need that you have anyway, and is actually really easy to get into if you pick simple recipes to start out.

Maybe pick a few dishes that you've never tried to make before and see if you enjoy the process enough to want to branch out.

As a bonus, it's one of the sexiest hobbies to have. Nearly everyone likes good food, even if its just a simple dish that you've perfected.

Alcoholism (beer/whisky/wine/whatever snob) and masturbating are always good hobbies to have. You could probably wring some "prestige" and profit out of these if you're so inclined, but I don't think that's on the cards for majority of people. As a somewhat proud beer & whisky snob, it's great hobby for burning your excess money too :)

Just going outside, to the nature preferably. Not to the mountains though, that's too serious and snobbish.

Rubik's cube (cool fidget toy, not too hard to memorize the algorithm), learn Morse code, read free books on libby, diamond dots.

Bass fishing, golf, hiking, plane/trainspotting, conventions (without cosplay), all invented because "meeting up for a chat" and "talking to strangers" aren't "cool" enough but secretly want to

unsuccessful unprofitable talentless hobbies associated with losers

Yeah Warhammer is pretty neat.

I feel like just starting to make myself do that hobby 10 minutes a day is a good way to get back into it

Collecting things, writing (since you would already know if you write this post or journaling[ try a junk journal]), reading, video games, photography with a phone doesn't require a skill or learning curve, hiking, geocaching, yoga( doesn't require talent but you have to memorize the poses and be flexible), exercise, volunteering (ie animal shelter), be an enthusiast (ie movie, food, or other niche within a category).

If you are worried about "talent" or "skill" required for any hobby just know: I am a musician, artist and writer. When I was 20, I was so bad at art I could barely draw a line or a stick figure; I could barely play a chord or identify a note( after a whole few minutes lol), my writing sucked.

I went on YouTube, binge watched videos, followed tutorials, read blogs, took free courses on platforms, and now I can get atleast a few people to comment that they like my work. Rather, being good at something is subjective and only matters to the person doing it, not who you compare yourself to. I was in the least bit creative as a kid. In my twenties, I actually checked out books from the library about creativity and how to hone it. There are also many YT videos for less effort. Also consider that abstract art can be literally anything you put on a canvas, and you can even make your own sub-genre of abstract art up, techniques and all. It can be non-profit but I have seen people make 1K per marble pour on canvas which a ten year old can do and sell.

I've dabbled with home brewing, lock picking, drawing, board games and video games.

Fishing fits the bill

Collect physical media. it's pushing back against having a subscription for fucking everything, it's a fun little treasure hunt that gets you out of the house, and it requires zero skill because it's just shopping. Be warned local thrift shops will know you by name or as that guy who always asks about the video tapes (or whatever media you most want to find)

What have you come up with so far

try making pop-up books

Like ... reading books?

One Step at a time