This manga is way overrated/overhyped and does not deserve its 8.97 score it currently has. Story is the all too familiar power fantasy and 90% of the story is the mc grinding to become OP with almost no plot to speak of. MC makes a complete 180 on his attitude because he's now a CHAD with op abilities and a soon to be harem.
That said, I will admit that I am isekai trash and so i did still enjoy the read. But I could not stand back and see this kinda average power fantasy getting a score way above what it actually deserves. If you're not trying to find a work genuinely deserving of a score of 8.97, this ain't it chief.

TLDR; generic power fantasy plot but with nice art and HEAVILY overrated.