I've personally never had depression but one of my best friends has/had it, she joined my friendship group 2 years ago and this was after shes had depression for 3 years already but in the past year or so we've (our friendship group) seen her open up and just seem happier. When she became friends with us, we were a close knit group with me and one girl having been friends our whole life, and knowing the other girl for 3 years but she clicked with us and we knew not to push things and understand when she cancels or just doesn't want to plan things with us because she's having a low day, when those days happen we include her in our plans (generally without her knowledge) just in case she changes her mind before or even on the day and she realises that we love her and kind of understand her as much as we can without experiencing it. Like I said she's not 'cured' but she's coming on days out a lot more and even suggesting some, and she's becoming more confident. We're also teaching her to be more selfish in a way because people tend to push her around or she'll volunteer for everything when she can't handle it so we keep saying to each other (not just her because I'm kind of the same way with strangers) "be selfish" and at first it was just with us but now she's doing it in work more, i.e not taking as many hours, and the self-care we're make her do like we all do facemasks in sleepovers, we make sure we text when we all get home, we message each other.
It's starts out as the little things that change, ones you won't notice but eventually you will, or other people will. It's not like a light switch that just turns off one night and doesn't come back on, you just have to chip away at it. I mean it's can just be your brain not producing the right amount of serotonin, thats not your fault and honestly your depression may always come back and you'll have a bad day but just build a good support network around you who will understand what you want/ need on those days whether its company or to be alone and what you need the days after.