since time doesnt pass within the keeper halls, you can have your followers or yourself keep using the workout mat, generating bottled sweat which can be sold for a decent price. selling 50 bottles got me to 6 digits, if this is unintended behavior i wish to notify you about this now

Well you can also edit the save game as it is a plain text file and enter simply any number of cash you'd like (or unstuck your characters which happens fairly often)

capture, breed, and sell slaves and prisoner. you will make far more money and wait around much less