I'm looking for a theme like theme, to be able to sell many themes

Hello, I am looking for a theme or script that I can sell many themes. Could you help?

Try one of these https://themeforest.net/category/wordpress?term=digital%20marketplace

There are many themes but I am unsure which one I can use.

At least the first 10 of these are all digital marketplaces so it should be possible to use any other of them