adsstudio, since you said it isn't converting yet, I'd hold off on picking a channel and first work out where people drop. Split it into three: is the traffic relevant, do visitors finish the first meaningful action (signup, add to cart, whatever yours is), and do the ones who buy come back.
Clicks rising while sales stay flat usually points at pricing, checkout or a landing page that doesn't match what the ad or post promised. A new channel won't fix any of those, you'd just pay to find the same leak again. Once that step is sorted, bigcake's idea of one channel with its own tracking for a month will actually tell you something.
Which step loses the most people, and over what time period are you looking?