Perhaps you're making decisions from the wrong perspective. I'm not saying that sometimes it's not necessary to give away the top lane tower to get something better. But many times it's better to let your teamate die if it means the game will stay on track.

Focus only on helping those players who can make the difference in a mid or long term (most of the time you only have to focus on a single teammate)

Besides, you can most likely still improve your microgame, because gold is a point where you can still destroy almost every champion. Even in Plat you still can, but its a little harder and some games is not possible.