I think leafo meant *AI* generated content, when talking about generated content (or "generated" in contrast to developed/coded material. Like uploading your photo collection or a daily audio blog, because it is "low" effort.). But the answer stands, you have to contact support to lift the soft limit of 20 projects. And a project a month is hardly any spamming.
But it would be good in general, if there would be some kind of subpages or individual priced files to a project. I do not know if your situation would apply, but "dlc", while having a bad connotation for some players, is exactly what would be right for some projects. Things that can be bought extra do not always warrant an extra project. There currently is like one method to buy one extra level of file access, but only at the first purchase, since you cannot increase your donation level.
So buy base game for 10 but do not get the bonus file that is set to 15 - you cannot pay 5 extra later to get the bonus file, like soundtrack or whatever. You would have to pay 15 again. So devs doing it "smart" have to work around the itch payment options and make a separate project for stuff like that.