The End is left vague purposefully, but I think enough was explained. You can think of the ending as a showcase of an original novel I'm planning, and Ian is tied to it.
I know some may not like such a vague ending, but I think it's for the best because I want to establish some rules for my future novels which I think I've done quite well.
There were a lot of unknown things in the novel from the start and almost all of them were explained. It's just that new unknowns surfaced.
The journey of Ian has always been one of finding answers, and he did find the answers he sought as you did with him.
That has always been the goal, and it's been achieved, so I felt like ending it here was perfect, but who knows, share your thoughts if you disagree.
In contrast to Ian though, you all will have to wait for the answers because I'm still not ready for an original novel, so I'll give another Fanfiction a try.
Hope you enjoyed the journey. It was certainly lovely on my side. It was chill, and I very much enjoyed myself writing this, so thanks for riding along!
Lastly, I have already started my next novel, so please check it out by heading to my profile, and leave a like while you're there. You can also just search for it by typing in the search bar 'One Piece: Limitless System'