Fermentation is the way forward.
I have been rather spergy with my love of kimchi this past year, but thats only because
a) It tastes fucking amazing
b) It is *insanely* healthy
c) It can go with almost everything if you pair it with a decent dressing or sauce
d) Its really easy to make when you get the basic steps down
e) Its easy to get ingredients for at a good price, either from the grocery store or online
However I will admit that it kinda smells like a dead san fransisco hobo on a hot day, which can be somewhat of a disadvantage if you live ten miles upwind of human civilisation, so it may not be something everyone can realistically have on a regular basis. However if this is the case then you can fall on my tried and trusted backup for when I have excess cabbage which is Sauerkraut.
Its even easier and less resource intensive than kimchi, as it can be made with literally just salt and cabbage, can be customised for other vegetables you have on hand, just stick to the ratio of 2% salt by weight, i.e. if you have 1kg of cabbage, use 20g salt, and keep it submerged under its own brine for two weeks and you have yourself a healthy and incredibly palatable and versatile sidedish or relish.
Obviously you are a big boi, and can probably google your preferred recipes for either if you choose to try, so instead I will offer the following pieces of general fermentation advice that might not be in these recipes
a) USE WATER WEIGHTS: Put some salted water in a clean mini plastic bag/ziplock bag, push it down over the kimchi/sauerkraut until completely sealed to the air, then top up with just enough salted water to cover.
b) UNDERFILL THE JARS: leave atleast an inch and a half empty on small jars and 2 inches or more on big jars so that the ferment can expand without leaking
c) LOOSELY SEAL THE JARS: dont let pressure build up and crack the jars
d) STERILISE JARS IN OVEN: put the jars in the oven at 100c for 15 minutes or so and leave to cool. Sterilise the lids in boiling water.