Binge reading the last 40+ chapters on Mangaplus helped me a lot in starting to appreciate again the manga. I've still to come to terms with the fact that we probably won't get more romantic development for a while and we risk getting an open ending, but I'm a bit more hopeful for the future.
Anyway, seems clear to me that sensei is going to cosplay again in the end, so we have to wait and see how they are going to make her change her mind.