20$RPM in Adsense? But I don’t have enough traffic! What to do?

I optimized my CTR+CPC so I get something from 10$ to 20$ RPM, but I don't have enough traffic! What to do?
I tried SEO but I didn't get ranked! I tried to grow my accs in social media but still getting small amount of traffic.

I tried using forums but they something about 20UV for a lot of work…
Any ideas?