If the MC is saying "I don't have time for games like this" when trying to date Kanae, then you most likely triggered the "I can't go back" dialogue by brainwashing and/or swatting too many small curse bugs.
You can't see Sora anymore, she's removed from your party if you had her, you no longer have the Sun skill tree if you unlocked it, and you won't be able to trigger END_A. There is no going back from this state (beyond loading or starting a new game).
You'll know if you triggered the flag by checking the Library's Cursed Room (if it's the black one, the flag was triggered), or by checking if you can get to Sora's dream (if you can't, the flag was triggered, with an exception just after Kanae's house).
If the MC is saying "Maybe I should do other things instead" then it's just that the rest of the dates are in the next chapter - check on Sora and/or do the rest of the story events to proceed with the story.
You can check the collapse points and level from the hub dialogue and hub room (south computer). You cannot lower points and level, to my knowledge, and Violence level 3 is exclusive with Lewd level 3.