Good day as most webmasters use domain name as key world keyword i have a domain kingkoopa.com and i also want to make very relevant niche that can earn good adsense revenue so please suggest what niche i use to start on kingkoopa.com that can earn good from Google
I did a Google search on King Koopa and i saw it's about some cartoons. So either go for those cartoons niche or sell it (or forget it and never renew it)
I don't think you can make enough useful traffic from a cartoon to earn a decent amount of money for any work on content. You could use this domain name for anything totally unrelated, or just forget it as suggested.