Eating the rainbow, colour me confused!

[RainbowConfusion]

I am absolutely certain that I am overthinking this, but am interested in some opinions!

I live alone currently, and am trying to eat more fresh foods. So far, so good. I will usually have salad wraps with fish or chicken or mixed root veg with roast chicken. Simple enough, and tasty.

Thing is, there is all of this new info encouraging us to consume more colourful veg, but in attempting to do so, I often end up with a good bit of waste as I can't eat all of it before it begins to go off. I am happy to keep some frozen veg although not all of it (especially salad) can be frozen, and the texture isn't as nice with many veggies.
So far I have frozen green beans, sprouts and peas , but not had much success with others.

How much colour variety do we realistically need? And is this per day or week?

I am trying not to produce waste or spend too much, so am a little confused.

Say I buy a bunch of salad items (leaves, radish, tomato, cucumber, etc) and root veg (carrots, potato, parsnip, sprouts), most will begin to go crappy before I get to them.
Maybe eat salad for half the week and root veg for the latter half?

If you live alone, just put me out of my misery and tell me how you do it, lol

When I buy a bag of sweet potatoes, I cut them into cubes and roast the whole lot at once, then freeze what I don’t eat that day. I'm going to try it with carrots too.

Soups are an obvious way to get loads of variety of veg - make a big pot and freeze (the Lakeland soup&sauce bags are good for this). I think my current batch has onion, garlic, carrot, celery, peppers, tomatoes, herbs&spices, and a couple of tins of Asda ‘Mexican 5 bean mix’. There’s not many types of veg that can’t be made into some sort of soup if you’ve got an excess.
re salad leaves, I agree that something like Little Gem lettuces keep better than packs of leaves, but if you do get the latter, if it’s things like rocket, spinach and watercress you can get through more of them by wilting down into a pasta or whatever rather than eating raw.

the one veg we simply don’t bother with (except with a roast when DD is home) is potatoes. You could maybe buy just an occasional big baking potato, you don’t have to buy a big bag. Or keep some aunt Bessie’s in the freezer.

Have you considered looking at shops other than major supermarkets? Near me, there are several small convenience shops, seemingly Asian owned, that sell loose veg. This has the benefit of less plastic waste as well!