I'd actually recommend stopping on Wedensday night, then using the new "Jump to Day" mechanic to jump backwards. Since you've already played all those calender events, they should be safe to play through again. Then, when Act IV comes you jump back to Wednesday, and play through so it kicks off naturally on Thursday morning.
Viewing post in is it safe to play after finishing the last act
It's a Cheat function, so click on Ctrl+J to activate the Cheat menu (top right corner, looks like a Bug).
One worry is that because you've already played through act III's ending, the tie-off is going to be a little weird. I kinda need the player to wake up by that lake side, or the animation won't make sense :)
Sorry for the follow up. Got the debug menu up and tried to figure out what variable to do a jump back. I have enough saves to go back to almost day I want to replay so I can learn more about what to do. Then just stop at end of Wednesday and do again. At least until I have earned enough money that makes me happy. I did notice that I think I can just change my cash in the debug menu but takes the fun out of it.
Alright I loaded a save from Day 49 and played to Day 53 night, gained some cash and gems from going down the path 2x. Will it keep my cash and gem gains if I reset to Day 49 or 50 so I can increase cash and gems. I also went from level 2 I think to level 5 or 6. Will I lose those if I play from an earlier day also? I did save my game at Wednesday night so if I wait till Chapter 4 comes out I have a good starting point by going back to Wednesday night.
Edit: Bedtime so will look for reply tomorrow. Thanks again.