No. That's not true at all. He already beat his original party and the plot if far beyond that at this point. I'm guessing that you have only read a few chapters and didn't stick around long enough to see the real plot. The real plot is that the previous Demonlird wants to destroy the dungeon industry while the MC is trying to stop him.
The previous demonlord I mean.
Yes, I'm already bored at that point and just skim through hoping he will meet his childhood friend again... but oh well, I drop this bcs for me the first arc is already enough (￣ε(#￣)Σ
The manga is end until the mc defeated the hero party. first arc they got all the drama, tension, even bromance. I mean the plot is clear.
No wonder this never get the attention to get anime
（￣へ￣）the rest is ass. Just your average shonen harem.