My question is ... what are you looking for with selling? I looked into both Poshmark and ThredUP about a year ago.
Poshmark seemed more focused on getting you a good return, but you need to do more work to make that happen
ThredUP seemed to be more focused on just selling whatever you send, but you won’t get as much of a return.
I ended up taking my nicer things to Dress For Success, and then sending my more casual things to ThredUP. It’s an easy process, and I wasn’t trying to make money here, just trying to pass on responsibly. But I did manage to get enough credit from ThredUP to fund a new-to-me wardrobe pet last quarter, so that’s a bonus!