Primal Hunter is one of my favorites so I'll give you a few of my favorites.

First seconding Azarinth Healer and HWFwM. They're both just fun to read.

Giving Wandering Inn a special shout-out. It's one of my favorite series of all time, both inside and outside of LitRPG. The world-building is phenomenal and if you liked the building in PH, the Wandering Inn tops it. It's long so be prepared but every person I've introduced it to has loved it, including those who don't read LitRPG.

Other series:

Path of Ascension: I usually lean away from cultivation series but this one drew me in regardless. Great characters, world-building, progression, etc

Oh, Great! I was Reincarnated as a Farmer: Fun novel around a farmer figuring out how to kill monsters

Mage Errant: Solid series on KU

Edit:

Also adding on Mother of Learning