depending on your budget and skills some options are
make a link list site again since you already have experience
https://nichepornsites.com/how-to-bu...ink-list-site/
make a auto generating porn site
https://nichepornsites.com/how-to-ma...tic-porn-site/
make a live cams site
https://nichepornsites.com/how-to-ma...ive-cams-site/
good luck
