I have give up at this point, and just enjoy the art.

Either I am not smart enough (highly possible), or the author doesn't have any idea themselves.

It's become a sort of game for me, to just skim through the latest chapter and see how many new details/mysteries/characters/twists they've introduced this time.

As far as I can tell, they still haven't resolved anything. They don't even seem to return to anything - they just introduce a new mystery and character(s), then next chapter... introduce another new mystery and character(s).

It's sort of entertaining in a meta sense.