It’s not enough to provide fresh food, water, shelter, and health care to a cat. You must also work hard to make sure your cat remains entertained. That means instead of spending money on yourself, spend that money buying your cat toys instead.
Toys provide mental stimulation and exercise, and your cat will enjoy it too. Just make sure your cat gets plenty of stimulation so it’s happy while you go to work everyday in a job you don’t like, just to provide enough material possessions for your cat to enjoy.