Waste happens at the time of purchase.
Not when you let something go.
Holding on to things you aren’t using isn’t thrifty.
It’s hoarding.

Yes, you spent ‘good’ money on something.
(Is there bad money?  Money isn’t moral, it’s a tool.)
Holding on to an unused item doesn’t get that money back.
If you haven’t used, eaten, worn, read, tried the item by now; you probably won’t.
Admit it and move on.

Spend wisely.
Shop with purpose.
A sale price isn’t always a bargain, and cheap usually is.