I think the usual recs are things like start small and consistent and take care of your physical health (not over/under sleeping, good diet and exercise, keeping yourself and home clean, etc), hobbies, cultivate relationships, etc but if you’re not able to take the steps to make those things happen you may need a professional’s help who can offer things like talk therapy, behavior therapy, medicine, etc. i.e. If I have a sprained ankle I can keep weight off it and wrap it to let it heal, but if it’s a break I’d need a doctor to maybe set the break and cast it to get it to heal properly, similar for mental health some stuff you can do yourself but some stuff takes someone else trained to heal or help identify the difference between the two.