Cheat Days on a Diet? How often?

I am on a Paleo Diet and my goal is to achieve a 40 lb weight loss by the end of 2022. Since I started sometime this week I have done a good job at sticking to the diet; however today last minute I made a pizza for my Dad and decided to have some and call it a cheat day since it probably isn't good to restrain myself from bread and cheese forever. So how often should I have a cheat day? I was thinking every Sunday and then Monday through Saturday I'd do Paleo. Do you think a cheat day this frequently will stop me from reaching my weight loss goal? Obviously, also holidays and birthday parties will be cheat days as well when they happen. So tell me what you think and give me any tips or advice that you can give.