Walk, lift and do stuff for your health. It’s better than eating, because once you are fit enough you can really eat what you want in quantities that you want. You learn along the way that it feels nice to be healthy too so unhealthy cravings go away.
Spend more time with family and close friends, even if its text or voice chat on discord. Having closer relations with people is beneficial for mental health. Relations where two people want help each other flourish and grow are the best. If you like games i would suggest speedrunning - joining and posting your runs, if you like boardgames - chess or go(baduk) clubs and tournaments, if you like crafts - some workshops - like pottery or woodworking. Finding people who you can interact with in “getting better” mindset eorks wonders, and makes person more motivated.
Learn stuff that you can make on your own - food/cooking, sewing, small maintenance stuff. Overall, “working with your hands”, is great. Not only you learn something useful, but also it gives space to be brainless for a while when peeling onions or whatnot where i feel at rest. If you are in position to get a pet from shelter and be it’s companion - do it. If you can’t - shelters usually accept volunteering. Pets teach compassion and provide comfort. Taking care of other being and learning its behaviour is fun on its own but also beneficial to reevaluate your own behaviours. Inevitably living with other living being changes a person, i think for the better. I definitely changed since i got my best friend from the shelter. Weed if you would be into it. In your case probably more of sativa to get energy and be talkative, more around the house, do small things to rythm of good music for few hours. You can lock in on task for long time.

YMMV I am neurodivergent just ideas to evaluate. Wishing you all the best <3