[d12b]

It sounds like you are getting very low CPM from google adsense ($0.50 ecpm?). Are your visitors from the USA?

You should consider DFP (doubleclick for publishers) and than run some competition for adsense. Rumor has it that it will drive your CPM's up. competition can be any ad network like Matomi, DSNRMG etc)

You can also contact companies such as the Rubicon project and they will do this work for a commission of about 15%-20%. They claim to do better than adsense in certain markets.

My last advice is https://buysellads.com/ where you can post your inventory and ask for more than what you currently get.

Oh, you can also contact adsense help desk and ask them to advise you on how to improve the location of your ads (if your ads are currently on the bottom of the page, you won't get clicks or $$)

good luck!