Garden lockdown!!

I'd grow only seeds that I could save seeds from - no F1s.
I'd learn how to save seeds from cucurbits , especially, courgettes, cucumbers and squashes. I'm OK with beans, peas, tomatoes and lettuce and kale.
I'd concentrate on making more compost which also produces the leachate that I use to feed the plants.
I'd propagate "easy" plants from cuttings like herbs, perennial kale, soft fruit to swap.

Overall, I think I could do it - so I might give it a try.

Isn’t that pretty much what you do anyway?