I Gave Up on Conquering the Heroines

For unknown reasons, I found myself in a game and am on my 12th attempt at clearing it. It appears impossible to achieve the “conquer all heroines” ending. The moment I decided to give up on conquering the heroines and aim for the “defeat the final boss” ending instead: [The monsters in the dungeon are strengthened by Saintess Jill’s blessing.] [The monsters in the dungeon gain weak toxicity due to Witch Yulia’s curse.] [Cold air envelops the dungeon because of Frost Lord Yerina’s grudge.] The heroines started blocking my path forward.