This series is the best in the genre. There is also none that even get close. You’ll hear about the farmer book or the market series, but they aren’t there. in litrpg you’ll notice that a lot of it is written for teens or young adults, but Matt Dinniman writes for adults. I can’t recommend enough. Also another common problem with Litrpg stories is that the characters are over powered and get into fights and dominate because of some newly acquired skill. Here there are fights that are win easily, but there are fights that they struggle to win or get lucky. In both situations there is a sense of combat, not simply walk in and beat everything.