Agree, interaction is crucial... it's an investment of sort too, that you should feel is worthy. And it bothered me too, that my posts were doing shitty in the beginning, but I still haven't landed anything on the trending page and I'm ok with that, cause it's really a combination of factors that let you do it, and quality is far less significant than high rep and numbers of followers, who push you up with their upvotes. You need to be patient, and eventually you're gonna get there I think.