the thing about living with mental illness for decades is that occasionally your brain will be like hey you're useless and should kill yourself and your only real reaction is cmon man right now im in the middle of something
spending enough time creating things with your hands (baking, drawing, scrapbooking, doodling, crocheting, journaling and so on)
keeping track of things like pretty skies, milestones, happy memories, appointments you're looking forward to
listening to music that genuinely makes you feel happy and energetic
making a habit of reaching out to people in a way that's comfortable to you (i send my dad songs he might like, my friend sends me monthly life updates)
being kind to all your five senses → like investing in a scented candle or essential oil dispenser or body mist, having a soft blanket or socks (or a soft animal to pet), listening to birdsong or the rain, looking at the sky more often, and having your favorite foods enough times