I say we take from That Other Popular Farming Game that's popular right now (no naming names lol) and give the option to dig through the townsfolk's trashcans once a week (unless upgraded) for spare crafting materials and items. Here are some examples:
Current items: Fish bones, wood, wire, parchment, pie tins, and maybe a corn or two from Jill's trashcan since we all know she has to waste some of it.
New items: Empty tin cans, plastic bags, and maybe compost that can be used to boost worm production.
And I know it would be tedious to dig through everyone's trashcans individually, so it should be treated as a pet collection list and be harvested all at once, and/or maybe with an upgrade like the bulk store/slaughter options.
Additionally, we could get a new pet option that is a Common Raccoon that can collect the trash treasures too, especially the rarer ones at level 6.