Hey Rich. Make sure you updated the domain at your market registar. Then summit at Sedo and afternic for free, ( all this if you still didn’t do it ) .
Use your twitter and facebook to follow forums and crypto blogs and share your domains ( make sure you don’t break rules and it is alloweed to post domains.
And just wait, I don’t see impossible sales. But try to open to other niches and try a good hand reg. Little by little increase your portfolio.
You can even use efty landing page to show your domains.
You have a lot of options to sell domains just read as much as you can, and of course it’s better study the market without spending a penny that register 20 domains with no sense.
Hope it helps.
-Manu