Use a base sauce and change it to get variety.
Example, I'll make a sauce from pork mince. Add some onions, tomatoes, thinly diced carrots and celery. Salt and pepper. I'll eat it with potatoes and green vegetables.
Next day I'll add a tin of tomatoes, or blended fresh ones, a bit of garlic and some oregano. That makes a nice sauce for spaghetti.
Next day I'll add some kidney beans and chilli and eat with rice.