How can I fully automate my phone farm?

About Phone Farming:

Phone farming is a method utilized to create passive income by exploiting a mobile incentive program using multiple phones to perform the same action simultaneously. It usually involves exploiting paid-to-watch apps or other incentive based programs over dozens of phones in order to increase the total amount earned. The term can also be applied to operations that orchestrate dozens or even hundreds of phones to create a certain outcome such as improving the ratings of a restaurant in Yelp or bumping up ASO in App Stores via 5-Star reviews.

I have to manually operate 1 phone at a time to get rewards and I have a total of 50 phones running. It becomes a bit difficult to handle 50 phones at a time. How can I make my phone farm completely passive?