gold Dolvaz

Just awesome!! Congratulations!

but 1 sells every ~3 months

But it depends on your strategy. You can wait for months to sell high or you can lower the price and sell to bots. If you dump enough, they'll immediately buy. I sold many cards for IMX in this way; probably, it's the same about ETH. I also was surprised about bots' prices for shadow cards - although not too many people buy them, I could often sell shadows to bots 2-3 more expensive than a meteorite.

No idea how much they can pay for this gold version...

You can start from 17$ and lower slight step by step - you'll need a long while to do this properly. It can be that a bot will buy for 8-12$. But nobody can guarantee it's not 15$.

If you wait, you might sell for a better price or you will never sell because people will regularly set lower prices so you might miss your "every-3-month" chance. While 8-12$ in ETH will become 80-120$ at some moment... Or Dolvaz will get a good buff and will cost 10x in a month or two... Nobody knows 🙂 A new set can make Dolvaz and MJ cards more expensive... Or bots will stop buying when GU declined enough deep and there will be no such opportunity anymore.

Do your own research and not financial advice 😄 I've just shared how I see the thing.