Then it's a labeling problem. Litrpg usually translates to actually visible (for the reader) game elements. So one constantly waits for a thing that simply doesn't come up.

Furthermore, a little reshuffling of the chapters would do a lot of good, since the MC is relegated to a place behind the side characters. Maybe couch the backstory of the SCs in a flashback? 

This is a LitRPG in the same vein as The Wandering Inn, so all the Skills' secrets are meant to be uncovered by the characters themselves instead of a description from the [System], it's just a style choice really. Sorry it didn't meet your expectations. 

I don't know which chapter you are on, but the 'side characters' will get plenty of chapters of their own, so the idea is more that despite Livia being the leader and frontfigure the other team-members are equally important.

It's sort of inspired by 'Arrogant Young Master Type 4 Template A'  that just because Livia fits the box of protagonist and is a timetraveler etc. she isn't special because of that, and doesn't get extra attention from the narrative, instead her actions will do so in the future to earn her that status, like Erin in TWI