After the initial premise of preventing her own death had been resolved, there was nothing left in the story to do. It would've just been her living her life and rooting out the rest of the corruption, I guess. There is a reason why most Isekai, no matter how trash, try to immediately give the MC a main goal that lies far off in the future in which the individual arcs are the challenges and opportunities for character development on the way there. Otherwise there is no golden thread throughout the story.
Of course most Isekai don't execute this very well, as most Isekai are trash, but the intention is to not just jump from one seemingly disconnected arc to another, but make the story more coherent. As I said, the premise of the story and the goal of the MC were resolved very quickly with no challenge or tension whatsoever (which I was initially fine with as I thought there would be more to it, which, as it turns out, wasn't the case) and after that I find myself just not caring enough about her situation to enjoy whatever "benevolent, wise empress"chess move she does next. The weird time travel shenanigans and even weirder possible twist of this being a sort of 're-re-incarnation' do not particularly help