I've sold a lot of domains on Sedo from 500 USD to upto 5000 EURO per domain, but it was a long time ago, i guess 8-9 years ago, not much into domaining anymore but SEDO was good place to sell domains at least at that time
There're many big guys in domain industry that you can list your domains for sell such as Flippa, Sedo, Godaddy Auction,...If your domains have attractive enough, many brokers will contact you then you don't need to find each guys to give offer.
Good luck to you,
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