This series really is the peak of what isekai can do. A delve into the psychological aspects of this journey is really what cements things. The failure of all his blood sweat and tears, his loneliness - it's all extremely well done, even when showing how OP he is. This isn't typical power fantasy bullshit, because we're going to see everyone and everything that drove him to where he was today (or more likely, it'll get cancelled well before it, or shortcuts jumping several worlds at once due to 100 being way too long, even if we dedicate say 4-5 chapters per - also character overload potentially).
What DOES get interesting is if there ends up being a larger overarching plot consuming things. What if someone is following him through worlds and such - lots of potential from an otherwise already great series.