Keep going!
Sekiro is the first game I ever felt a reason to play ng+. I've gotten 3 of the 4 endings and beaten 3 of the 4 gauntlets. I'm keen to do the 4th tu some point, but I looked up what that last gauntlet has in store for me, and honestly I'm kinda scared to try. Because I'm going to want to beat it, but not sure I'll actually have it in me...