This is a discussion, and opinions will run many different ways. I will suggest here something that will not be popular: STOP HOARDING.
Many folks here have parts from a myriad of cars, some useful, some not. When you have stacks of parts and pieces that you haven't touched for years and years, get rid of them. Sell them (someone might need them), and after a reasonable time, get rid of them. I had wheels and bumpers and a few other things that I took to the recycling place and got some cash for. The remaining seat went in the trash. Other pieces went in the trash. Parts I tried to sell that had no market? Bye Bye.
If you have wheels, bumpers, seats, mufflers, broken or bent parts, from a car that you no longer own, and that are in such poor shape as to have no value, get rid of them.
My father in law passed away. He has two large garages FULL of contractors materials that he hadn't touched in MANY years. His family is now tasked with combing through it and will eventually need to hire someone to haul the vast majority of it away. It is a waste because most, if not all, of it is essentially junk. It might have been useful one day, and some components might be useful to one person on one occasion, but overall, it is just junk. I don't want to leave that for my family.
So, re-purpose (hard with some car parts), re-use (maybe, if I still have the car), or recycle (old wheels and bumpers and other junk with essentially no value). What will be left when I am gone are tools, and a completed car.