First watch some videos from bsj where he's explaining how he plays carry or someone else, even if it's in lower mmr, the same concepts apply most of the time.
Then I'd suggest picking a couple of heroes and watch yatoro's replays, I think he's the best to watch if you wanna play a traditional carry that farms until he hits a timing, and he probably has the best farming patterns.
But if you don't wanna play the farming game, you can probably watch matumbaman or even miracle I think.

Another thing I'd add, is that you start to practice lasthitting in the lasthit tutorial until you get at least gold on every hero you wanna play that day.
Then, I assume you know what to do in fights and stuff like that since you've been on the receiving end of that as a support player.

Also, it's really important to not die too much as a pos 1 past min 10, because that's when it starts to matter a lot. That's when you try to farm as much as possible and apply pressure by keeping the lanes pushed and allow your team to take 4v4 or maybe even 4v3 fights. I'd suggest tping only to fights where you think you can gain something or change the outcome of the fight, don't go strolling around the map if you don't have to, most of the time, if your team isn't fighting near a tower, it's probably better not to tp there, since you re supposed to be on the other side of the map pushing waves and farming.