I'd also suggest try cutting out all caffeine and stimulants (if you take any). For me, the transition took several months and caused a bit of irritability, but getting through it changed my life. No more crashes, no more anxiety, no more headaches, and now I sleep easy.
This is a good idea. I'll offer you look into local parks and nature preserves, and if you have them where you live, forested areas. Look into "Forest Bathing" and "Shinrin-yoku". There's really something to this.
it's not about people liking you lol, being a people-pleaser is the last thing i'd want anyone to be. these are just couple things that keep most people grounded, enough to serve as a baseline in keeping them sane and functional. it's fucking hard and almost inhuman to tick them all at the same time, but it's worthwhile to give some of these things some time every once in a while.
it is not about being liked, it is about feeling better. walking have always been my to go solution when I have the blues (not full blown depression though). I am not saying it will fix all your issues, but it MAY improve them a bit and it won't make them worst. (not sure if your notion of health included exercice)
Sleep problems may be a symptom of depression, but they may also be the cause of depression. You could try finding a sleep physician or a CBT-I therapist.