I've had decent luck in the past with LetGo if you live somewhere with a decent amount of people. Small urban city or larger, I'd say. I've also had luck with Facebook marketplace, however these two options are best for meeting people in-person so consider the pros and cons of meeting with strangers! Poshmark is a lot of work BUT if you have any bigger ticket clothing items, it may be worth it (it wasn't for me). I almost used ThredUp because they have an option where you can send in a bunch of clothes and they will pay you for what they keep and recycle the rest for you, however I didn't use them because they pay an absurdly small amount. Have you considered Craigslist or just making posts on your social media? Most of the things I sell (besides bags of clothes I take to thrift stores) sell to friends via my Facebook profile.