I'm looking forward to the class change. I assume he'll achieve it by collecting bits of Lu lium from the war. In the meantime he should be getting quite a few skills especially from the monsters.
Then he just needs to die and reset. I'm gonna be pissed if Rena stays dead. I mean other characters can die but too much of the plot related to changing her fate. Keeping it this way would be way too dissapointing.
Also it's good that the "point system" that appeared out of nowhere was only for a forshadow. In fact quite a few system concepts the author added that I vaguely recall faded away. In the end the level system, absorption system, and reset systems are the only ones the MC needs and the author is finally hitting a balance with them.