I sow more and then go to plant swaps.
I used to leave spare plants and harvests outside on my front wall, we lived in an area where people would walk by all day long as we were nar a canal. So lots of my spare plants went there. Also to community gardens etc.
When I moved to France I was a bit bereft as I couldn't order from my usual Real Seeds etc places but after nearly 11 months I've found a new set of seed producers that are reviving old varieties, and testing for what grows in extreme drought, and more storage varieties so lots more opportunities to trial new things.
Each new seed supplier has something interesting to offer but I need a decent amount to make the postage worth it.
Plus this year we were growing in new ground and the old veg patch and found that the previous owner never composted any of her grass clippings, she just dumped those in the woods behind the house. Now I've grown for nearly a full season I've got more of an idea of my layout, and what gets sun when, the few places that are shady, and so this winter I've got alot of work to do to reconfigure the space ready for next spring. And I'm using the grass clippings brought back from the woods as a base for each bed.
Today we are clearing out the builders bag that last year's leaf mould is in, ready for this year's leaves which have just started to drop. I've started sieving the leaf mould ready for it to be used next spring.