If you can't sell it on EBay , Facebook Groups, or Craigslist, then you have probably overpriced it. Or it is no longer a current desirable look.

if it doesn't sell - it's over priced.

I've sold tons of remodeling cast-offs on CL. Good rule of thumb is that old sells for 25-30% of new.

Craigslist will let you bump your ad to the top a limited number of times (3 or 4, I think). When I'm selling something, if it doesn't sell in the first week, I reduce the price and bump the ad to the top and continue to do that each week until it sells. I generally price my items to sell and they usually go quickly.