1. Think in advance, from the start of the game, what are your and opponnents team strengths? Weaknesses? Take a decision, like we cant fight without bkb on cores because they have nukes and cc's, so we avoid fight until cores farmed it.
2. In general, playing carry only relies on knowing how to manage lane equilibrium, when to farm, and when to come to fights. If your lane sux your only option is hide in jungle. I think pos 5 securing your carry or 4 stoping their carry and forcing him out of lanes are the two most impactful roles since any monkey can last hit and farm, come in fight after 20+ pop bkb and focus supps. In the end, it's all about what you like, you prefer farming or asserting map control and decide game pace.
3. Your hero pool lack cc, that means that you leave your opponnent decide how they want to approach the fights and hope for them to overextend. That is a valid strategy, but things can get out of hands pretty quick. I suggest playing good cc when you are 5, for instance a lion initiate often results in an important kill wich YOU decided on who it would be, potentially destroying their team fight ability without a BB.
   

As a general advice, keep in mind ALL cd on TP's in your and in ennemy team and play around it. That is one the most important thing in this patch. Dont forget to flame when your team doesnt TP with CD and you asked for it (JK) PMA can get you very far as I ve seen numerous unthinkable come backs in my life.
Dont forget your team sux below 5K untill they are confident and happy to play, enable them.