I sold some unused items at a local recycle store.
I sold a portable monitor, three Bluetooth keyboards, leather boots, a camera tripod, and a G-SHOCK.
I was able to sell the G-Shock for about 20% of the purchase price, even though it had been used for about 15 years and was in bad shape. Selling is a good way to become aware of things like resale value.
It is a wonder that as I have less and less stuff, my satisfaction with my life increases. I will continue to do my best to get rid of unused items this month.