I honestly think the only thing you NEED to do with an RP is do something that makes people acknowledge it, look at the characters your RPing on study them and say something even if its short and wouldn't make a point to anyone but that characters handler that makes him/her want to respond. Also obviously as has been said before originality helps, try and find new ways of say I'm going to rip this guys fucking head off. I'm having some issues with that myself to be honest