I've been through this kinda rigmarole before when I tried using diaspora*, and the end result was that I completely abandoned it because I wasn't getting any meaningful interactions out of it compared to Twitter. Which was a shame, because I really liked diaspora*.
The problem, of course, is that you will inevitably gravitate to whichever platform nets you more interaction. And crossposts really don't engender organic engagement. They feel robotic and distant, largely because they're just that