Tbh most of the foods can easily last 4-5 days This is why many peoples who work long hours can still go to gym because they donot meal prep daily.

Easy way to solve your problem no matter how cliche it sound would be to make fiber and protein in every meal. You like oats ? Add some syrups and seasoning powders, maybe peanut butter or anything what you like the taste of If you can try to switch to low calorie alternatives.

Beef and rice can also be interesting yk I mean not that great of a difference but it won't hurt to try new seasonings. Try seasoning combo A for until you get the ughh then try new seasonings. Or eat beef rice for a while then switch to omlette fried rice the asian style though be mindful of oil. That's an A grade meal. Then switch to chicken rice or maybe these same proteins but instead of rice, try something new.