Twerk God

Hi guys
I own and Operate TwerkTubeTv()com I started the site 2 years ago and hoped to really build it into a site that would one day pay my bills and let me work from home. I have poured hours per day into this site and learned a ton of skills. I started out knowing nothing about the biz and now I'm starting to take it serious! To be honest i still don't know everything I should, but one thing every expert tells me is that I should be earning way more than i do.

So here it is: My site has evolved from just Twerk videos to a full scale softcore,entertainment,hardcore tube site.

I don't really know my niche.
I have a list of keywords but I don't think I use them the proper way

My stats: 90k visitors 300k+ pageviews per month 89% USA traffic

I had 3 appraisals done all said the site is worth $18,000 - 30,000 and that I should be earning around $2,000 a month

truth is I make about $50 a month off banners and ads using JuicyAds and Plugrush

How can I make more money per month?
Whats my niche?
Should I just sale the site now and start flipping websites using the knowledge I've gained?
If I hired a partner what skills would you recommend them having in order to improve earnings?

thanks guys in advance