okay, beat the game with max friendship, this was, aggressively amazing? like i appreciate that you can either Make Correct Choices or grind more.
To save the rest of you grinding: You can Make Demands whenever your total gems is about 10x whatever the upgrade cost is. So go make demands down until everything costs 100. Go buy a 100 upgrade, go buy a 50 upgrade. now make demands again.
Repeat this until you can't make demands anymore, then go make a ton more gems and do it again. I recommend bouncing between the Park (because bazooka combos) and the Rooftops (because Sword Beauty can knock people off the edge)