[help] gameofthrones.bio

should I build something on it? sell it? worthing anything?

How about not advertising it here?

Please visit the below sites to know the worth of your domain. These values will not be exact but an approx one, but you can use thus just for a comparison.
"http://www(dot)markosweb(dot)com/"
"http://www(dot)check-domains.com/website-analysis/website-analyzer(dot)php"
"http://freesiteworth(dot)com/"

I would be more concerned with the copyright aspect and get rid of it before it's just taken from you