Where do you sell unwanted / excess stock?

I have purchased 2 types of products from 2 different suppliers to ungate a brand on Amazon, but I was not successful.

The products are sitting for pretty a long time now in the prep center, and if I do not get rid of them, I will have to pay extra storage fees for the prep center !

So I think it is the time to learn to sell the stock with issues on other platforms other than Amazon.

I would appreciate it if you point me to the best and simplest platform for this purpose (eBay?, etc.) and a simple course/training/channel to learn how to sell on that platform.

Are they in UK or US?

You do not really need a training on how to sell on Ebay.

Just list the units that you have for now.

List it on eBay and enable the sponsored listing, so then eBay will automatically promote your listing & whenever you get a sale so they will charge their %…I think this is the best possible way to do it.

Second is facebook marketplace, listing it on Facebook marketplace.

No training required for ebay. List on Mercari/Poshmark/ Ebay/ Depop/Whatnot/ Facebook Marketplace.