There are recipes for crockpot tomato sauce.
Also, if you have a dehydrator, you could make tomato powder. That’s the most space efficient use I know of.
Tomato powder is really easy to use when you’re cooking, lots of info out there. I personally prefer it. Just need to keep it in ziploc bags or jars and somewhere dark.
tomato powder is the bomb when sprinkled on deviled eggs instead of paprika
I love the idea of powder! My boys all went keto so I really have to find ways to free up freezer space for meat, lol.