Omg this is enraging.. I am at 1 turn away from gettin to the Main Quest point and I reach the end time.

I might just quit the game for this, I know this is my fault but this is very punishing. I did SO much in this chapter, from min maxin links to weapons to exploring to gettin new characters trained. I miscalculated a turn it seems and theres no way to go back to a previous file thats near because of auto save?? I am not restarting the chapter. Any way i can go back a few days or something????