Boosting my ROA’s

Dear Sellers,

I’m working at a company for a while now, and i am the ”manager” of the Amazon marketplaces. No i really don’t have a game plan while targetting ads etc. I do a small keyword analyses and from there on i pick the products and make the campaigns. Now i wanna now from you guys, what tools can i use to boost my sales, get more information? Do you guys have like a ”game plan” while making your ads.