To be different from Progress Knight, I highly suggest doing what the title of the game is... and making it more about the magic. Completely remove the military stuff and combat skills and all the related items and just go heavier into the magic and mundane. Make the grind in common work longer, add in nobility ranks, and make it all feel pointless until you finally get magic through your first rebirth. Hell, instead of making it a rebirth, make it that you possess your own descendants. You've already done great in making houses one time buys per life, now make them hideously more expensive and make them permanent. There's so much you can do to still have the bones of Progress Knight/Groundhog Day, but make it entirely your own beast.