At least in you case I know what the problem is. I played from your save modified for v0.92.0 and also got stuck. So I looked into the script and compared it to v.90. It looks like the devs reduced the grinding and now fewer rehearsals are needed to continue. And that's the problem. If you're in the rehearsals room and talk to Michael the "Let's start rehearsal" topic only appears if you don't have enough rehearsals yet. And since the number has been reduced but you (having played an old version with the old numbers) already did more rehearsals the "Let's start rehearsal" topic does not appear.
I've made a small modified version of
this cheat script and attached it.
Copy the cheats.rpy into your "game" folder (e.g. overwriting the existing one) and start the game. Shift+F12 now reduces the amount of rehearsals you did by one (and adds song topics).
It's supposed to work like this:
If the main task shows "Continue with the rehearsals" go to the rehearsal room and talk to Michael. If there is only the "I'll come later" option, click at it. Then press Shift+F12 once. Then again talk to Michael. If there is still only the "I'll come later" option repeat this until you get the "Let's start rhearsal" option (don't hammer Shift+F12 if you don't want to do several rehearsals again). Using your save modified for v0.92.0 I had to do this twice (a 2nd time after writing new songs).