I can't really blame you. The quality of the story started declining and has simply continued to do so, slowly, for about 8 weeks now. In these last few episodes, we got a few answers, but none of them pertinent or even interesting. I have no idea what the story is trying to do now. Is Luciel the only person who braves the labyrinth at all anymore? We haven't seen any others down there for 4 episodes.
The reception girls come to visit and... just hang out, I guess helping with his charitable healing in the capital and remind them that they exist? The whole beastfolk side arc was a huge, mushy misstep, and the substance x reveal was more flaccid than than my stand-up set. Complete waste to bother attributing Luciel's sexless nature to the potion when the audience already included it in his 'salaryman/reincarnation protagonist with a dream' trope but instead is an unfunny joke.
Just grinding, leveling, and everyone praising the MC. Where have I seen this before? Maybe in about a hundred or so mediocre isekai stories? The only remaining flicker of an interesting story line I have to grab onto is the emperor and the potential mystery of the dungeon, which we will likely not see.
Using substance x as an actual combat deterrent is too lazy and crass to be funny, and the skeleton fight it exploits wasn't worth devaluing the tension to make, effectively, another fart joke.
I'm not dropping quite yet, but I wouldn't be surprised if anyone did.