Freeze, can, dehydrate or eat fresh. There should be no waste. Even when I have a larger than expected crop of something it is all utlized in some way. An investment in a large canner is essential. And sometimes a lot of time and work is involved. Vegetable gardening is not just about knowing how to grow something. As far as a routine is concerned, most vegetables have similar harvest dates. It can be rather hectic processing numerous vegetables at the same time but once you know how it is nothing insurmountable.
Canning isn't a 'thing' in the UK. I think public health might be opposed to it as you simply cannot buy the equipment here. You really struggle to find it and when you do get your hands on it, it's prohibitively expensive. So for example, the lids for canning are extortionate here. Also, we tend not to have cellars or cool places where we can store produce. Nor do we have huge amounts of land. I have a huge garden by UK standards, but the entire plot is probably only 1/4 acre.
The norm here is to have big chest freezers and we freeze anything we want to store. People make jams and pickles for short term storage, but there's no canning involved.
But that said, I have purchased a water bath canner and some new style canning jars with reusable lids. Experiments thus far have gone well. The trouble is, even with water bath canning I understand that you need plenty of sugar and or acidity. Diet gets a bit unhealthy when everything is preserved in sugar and vinegar!! Although I know some argue that the dire warnings are overkill. I know my mum used to make jam and if it got a bit of mould she'd just scrape the top off. No one got botchelism.
Energy costs are going through the roof here. Hard to explain in terms that would make sense to you, but electricity has always been much more expensive than the US, and it's more than doubled this past year. Also threats of power cuts. So keeping things cool in summer and frost free in winter is tricky. Our houses aren't built to accommodate storage of food.
But absolutely you've nailed the problem I'm having. Not helped by the government announcing the latest crisis just at the moment when I need to be concentrating on my veg! Another problem in the UK is we're all very much plugged in to the infrastructure.
Mentally we're not as independent as I think many in rural parts of the US are. That's what I'm trying to overcome. I don't want to be thrown by every shock wave that hits the country!