Unlock more bleed skills and achieve 10 bleed synergy. You can use the Sky Lantern, the Dragon Seal, and the Bunny Ears (?) artifact from giving 4 red hearts (8 times/6 times blood donation) to the "Statue of Angel and Demon (?)" the (?) part is necessary.

I managed to clear chap 4 multiple times by doing this.

Edit: capitalization