Progressive fantasy is what RR is known for, and many series like that launch from there. There are others that are progressive fantasy adjacent. Progressive fantasy covers litrpg (and its many variants including 4x rpgs), so-called “cultivation” fantasy (wuxia, xianxia, etc). It shouldn’t be surprising since fighting animes have been around for a long time, and now isekai animes are now the rage, and those all overlap into progressive fantasy. There is a subreddit for this.

Other platforms will have other types of serials. I just don’t know them off the top of my head. My wife reads a romance serial somewhere else.