I couldn’t manage without a freezer - I’d do without my fridge to make room if necessary (not really, but maybe)
I’m not a natural meal planner at all. It’s too rigid for me but I have the bones of a system.
so roughly, I allocate a meal type to each day of the week - eg I might do chicken breast on Tuesday, but that might be a stir fry, or fajitas, or any type of sauce.
The chicken breast is already chopped and portioned and frozen because I hate that job. I toss in the flavouring and leave it to defrost and marinade.
It’s the right balance of routine and variety for me.
I use my freezer a lot - I have a meat drawer (prepped and portioned), a veg drawer (including chopped onion, garlic and ginger) a breads drawer, a potato drawer and a soups & sauces drawer for the ones I make. I use jars too and a good range of spices.
I have a designated place for everything - so the pasta sauce by autistic dc eats gets a 6 jar space, and the ones that I might buy on a whim also have a 6 jar max. It means there’s variety, but there isn’t anything languishing forgotten in the back, and if I know I can’t store it, I don’t buy it.
Because it’s visually organised I can see when I open a drawer what’s running low and how much space I have and I just restock the stores rather than trying to plan groceries according to a specific meal plan.
That means I don’t stock up on beans when they’re on sale anymore because I only have room for 6 cans max, but I have less food waste and I’m spending less on food than I used to.
It also means that if I just don’t feel like chicken on chicken day it’s not a big deal either.
I only buy enough food, salad veg, dairy etc for a week and use it up.