>>120383431. keep yourself reasonably busy
2. get at least one close friend or partner, or go deep into monk/asceticism/etc. for most people, one or two close friends and/or a partner is simpler than learning to love/accept isolation and completely cast off desires for social interaction
3. STOP GIVING A SHIT ABOUT WHAT PEOPLE THINK OF YOU
unless you fucked up and need to reconcile with someone you care about. I've learned that majority of social interactions are such bullshit so as to not be worth it, I have a gf and small circle of friends and I'm more than good
4. Be frugal. Financial hardship can ruin all sorts of shit, it can ruin friendships, relationships, and in general it is an undue burden. Do your best to live within your means, which brings me to next point
5. Be happy with less. Lots of shit leads to acquiring lots more shit and feeling empty when the novelty wears off. If you have a lot of stuff, that's fine, but if you're constantly buying new things to feel better, you're hurting yourself more than anything
Anything more than that, and I think the list gets tiresome, but there's obviously other stuff (preserve your health, clean water, good food, exercise, etc) which is definitely worth securing. And finally
Learn to love yourself, even if it's difficult. You're not the greatest, not even among the best, and your life is meaningless and empty, so trying to "improve" yourself to no end is an exercise in futility. If you want to change something, do it. If you stay productive and learn things and maintain things that are beneficial (again health, environment, etc) self-improvement will natural follow.
Physical decline can be minimized, mental decline can be too, unless there are genetic factors or things that are not addressed (don't be afraid to visit a doctor once in awhile) but the suffering of old age isn't really necessary, especially if you take care of yourself and keep realistic expectations - root of suffering is desire, etc.
