Technically, Cradle and the preceding series to Dakota Krout’s Completionist Chronicles, Divine Dungeon, are in the cultivation genre rather than LitRPG. That said, the two are so closely related that they can often be interchangeable. The biggest differences would be that cultivation uses energy/essence to gain power while litRPGs use experience points to gain levels. I think cultivation books tend to have looser rules(principles maybe?) binding them whereas litRPGs have more rigid video game constraints/rulesets (although the best litRPGs lay out rules early on that allow for a great flexibility in how a player can operate within them).

Speaking on both, I think the a lot of people gravitate towards the power fantasy of the genres which has led to them being oversaturated with a lot of sub-par series. There’s some good gems in there. Cradle is pretty good, I didn’t get super far in the series but I respect it. I do think Dakota Krout writes the best series in Divine Dungeon and Completionist Chronicles, although you do have to accept the puns, and that all of the main protagonists have very transactional personalities. The Life Reset series has an interesting premise and town management. If you want straight video gaming, I think Ascend Online is pretty good at capturing the best parts of the MMORPG grind, or there’s Awaken Online if you need to embrace your inner edge-lord.