There are many options for reselling your used clothing, shoes and accessories. There are stores that will pay cash, give store credit and/or offer consignment options. The stores vary greatly with that they accept so you might need to look around to find locations that are looking for clothing in the sizes, styles, age appropriate style, and brands that you have. They all want items that are clean and in good condition.
Some stores provide trade in options where they provide store credit for gently used clothes and shoes. Some stores only provide credit for their brands and items purchased at their stores while others will take items from any store.
If you have items that are not in good condition you can check out Threadcycle for locations that accept those items.