Many online stores will help you sell for a good price. You can sell your skins in the steam, but you will lose a lot of money because you will have to pay twice the commission. Therefore, the most profitable way to sell your skins is to turn to third-party sites. I often sell my skins here https://skinsmonkey.com/; it turns out quite profitable. Users from the forum recommended this site to me. It seems to me that no one sells their skins through steam. You have to be crazy to give away 40 percent of the cost of skins.