TGP = thumbnail gallery post = the site where galleries are posted
TGPs are not galleries
Sorry, but the whole site looks ancient and unimpressive, it has no traffic and honestly no potential (except for the domain name) .. and you want people to pay for listings??
Start with a tube, built a community site, then add new features once the tube gains stable traffic.
BTW - you can post pictures on both Xhamster and Pornhub and browse them conveniently in a slide show, why would anyone want to bother with galleries these days?
Personally, I would close the site the moment I see the main page.
Take a look at beeg or xhamster to see how an appealing site looks like >>> Fast, fresh and hot content, hot clickbait thumbs, video previews, amateur content, community features.
Offer them something special that will be eye-catching, at least nice and modern design and rare content.. the first impression is important.