Where to sell collection

Hey everyone. I hope I am not against the rules with this post. I am honestly looking for recommendations and not to sell anything here, as I want security for both sides of a potential deal. I am currently thinking about leaving the collecting part of the hobby behind for several reasons. If I should decide to do so, I am looking to sell roughly 450 minifigs in total, containing ~400 different figs. Do you guys have any suggestion where to do so? I want to sell everything in one go to make...