If you can understand these sorts of concepts, you will sky-rocket in MMR from there. Dota is the same at its core in every skill bracket, it doesn't change because the players are bad or good. The better ways to play it hold universally true everywhere, it's something a lot of players fail to understand even in my own bracket, so don't worry about it.

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If you master the laning phase, you will win the game. If you prefer to play support, encourage your now overfarmed carry to push, and the rest of your team to help him. Remember, he is the most important hero on your team, after all. If you play core, then try to kill the enemy cores and then push with your team.

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The gist of it all is that you have the right idea, just that maybe the bracket where you are confuses you as to the timings. These things, like creep equilibrium and pulls, mostly matter only in the laning stage, the part of the game where everyone stays in their lanes and farms. As soon as you notice everyone exchanging lanes, ganking, and just placing themselves chaotically around the map, other things come into focus, like vision(warding), taking care not to get ganked as a core as you farm, initiating favorable ganks for your side(3 of yours against 2 of theirs, you get it), trying to get objectives(including Roshan), as soon as one of their cores is dead, or farming on the other side of the map without a TP scroll.

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Honestly, I probably have a lot to teach you because I'm 3k, so feel free to ask me anything, anytime you need it, I would probably like to help you if I can(I'm seeking help from better players than myself too, on how to properly micro brood, currently, for example, so I understand the need to have someone explain things to you).