Hi Anna --
Without discounting anything others have said, and wishing you well with wellness, I would advise highly realistic culling.
This comes from the perspective of having health issues that nixed a lot of my favorites last fall-winter, then surgery and recovery which nixed a lot of spring/summer favorites.
Despite being a much more classic dresser than you, I've decided that if F/W stuff doesn't fit me in late August when consignment shops buy, it's going. I just don't want to go through another year with it sitting packed away -- too depressing.
Whatever they don't take will get a few more months, then be donated in season. [Ditto for spring.]
As CocoLion mentions, the deal with being a trend-focused shopper is that there's a shorter shelf life for designer resale unless a piece is kind of beyond trend or cult. So you could hold onto those pieces longer in hopes they'll stay with you or still sell well down the road.
When it comes to wellness and stress reduction I really prefer (and generally advise) adding healthier vs subtracting less healthy behaviors, but if you have anything to ditch, sometimes the latter gets us results faster.
[Or so I hope, since my rationalization skills met their match last month and I had to make some emotionally difficult cuts!]