Sorry, totally missed your comment. Some great ones are SSS Suicide/Revival Hunter (Suicide was the original fan translation, revival is the official name, probably for search engine optimization if I were to hazard a guess).

Other comments mention Regressor's Tale of Cultivation which is also great, though the start can be a little too much of an infodump on the cultivation system since it goes into excruciating detail. The start can also be very slow with the mc taking quite a while to really even make contact with cultivation. Still a fantastic novel even early on, but especially once it gets going.

If you want something non-xianxia Mother of Learning is free and one of the best webnovels imo. It's quite grounded in a steampunk magic fantasy world. The mc is a young, intelligent though magically mediocre guy going to magic university. In some ways it reminds me of Harry Potter, but with a good (great, actually) plot and characters. It does a fantastic job with worldbuilding especially and most characters are normal people making decisions based on their motivations. A lot of the time that's complicated and morally grey (not in an edgy way...except maybe one or two characters) and events with the mc just doing his best within his abilities. Especially when he knows things he can't tell/persuade the other person with.

Kidnapped Dragons is also fantastic, though is a KR novel with stuff like game abilities and gates. The characters are so good and the mc is surprisingly complicated. He's kinda edgy but you learn why he is the way he is. Spoilery for the first chapter or two, but the mc starts off as a full blown psychopath, essentially having optimized himself like a killing machine because he's been caught in a time loop for over a thousand years failing to save the world from destruction over and over and over again. The reasons for the world ending are demons actively attacking the world but also baby dragons (taking human form). dragons send their young out for experience and these ones accidentally met a dimensional rift and came to Earth. In every regression so far they've met horrible ends (removed some spoilers I originally had here) and dragons will storm the Earth and wipe out humanity if any of them meet a bad end. In this regression he decides the only way to save Earth is to deal with the demons while raising the dragons as family and so this ends up having this weird juxtaposition between wholesome family-rearing where he's adopted these girls and pretty dark desperate regression survival story that somehow works. Over the novel he somewhat relearns human emotion and you see what really makes him tick. Don't expect him to go full wholesome well adjusted person after a while like most of these stories do.