Finding Good Sellers Can Be Hard
Finding sellers can be a challenge, and finding quality sellers is even more difficult. You'll have some excellent sellers who dominate, but others won't ship on time or take returns when asked. Others could be rude to customers, which could give your entire online marketplace a bad reputation. Of course, there's also the problem of scammers you'll have to deal with.
Sellers on your site will vary in quality, but the best suggestion we can make is to impliment a a vetting process before you even allow a seller to set up shop. This will become more difficult as you grow, but by then the number of good sellers to bad should have already cemented your platform's reputation.
Another important aspect of customer satisfaction is to establish a rating system. Buyers can rate sellers based on their experience with them, and sellers who aren't performing well can be warned or removed from you online marketplace website entirely.