Eating the same stuff for more than two days in a row would be hell for me.

Freezer.

Eat one portion, refrigerated one portion (don't have ot eat it the next day. It'll be good for up to a week), freeze the other two.

I make ragú for pasta, eat one portion when it's ready, refrigerate a small jar for another 2 portions, and freeze enough for another ~10 portions.

You can do the same with soups, stews, etc.

Vegetables (root vegetables I guess. Not things like salad) are usually pretty straight forwards: olive oil, salt, pepper, oven, 200C, for 20 minutes. Not worth freezing, but you can refrigerate and things like potatoes and carrots will be just fine for a week.

I enjoy cooking as well so that's good to hear. The washing up part is eased a lot if you get a dishwasher. Even a small tabletop mounted one can be a big help. It's also good for the environment since it uses less water and energy.

About eating the same two days in a row I'll counter that with the use of the freezer or eat offset so make one large portion to divide. Eat something else the day after and then leftovers the day after that. Then its not twice in a row at least.

Or make dishes that can be twisted into different types. A bolognese can be used in a pasta dish one day and tortilla the next and then nachos if you have any left.