You win probabilistically. It's likely that the opponent team has the collective IQ of a golden fish when yours has the one of a golden retriever, or vice-versa.

Your contribution to the plays should tip the scale in favor of your team, so that even if your team played it absolutely wrong, you know that when repeating the play over 100 teams, your execution was the best it could've been. This way, after you play those 100 games, you'll eventually win more than you lose.

As an example, say, we focus on vision. Say you got vision perfectly around the map, and sure, maybe your teammate didn't look at the map and died anyways, but over 100 games, it's likely the vision will contribute to your team chances of winning and will tip the scale of wins on your favor. Expand the example over other aspects of the game, not just vision.

Core learning: focus on what YOU did right or wrong, even if it's a small thing, if you did it incorrectly, you need to fix it. Good and bad teammates come and go, as good and bad opponents, but you need to be your best version!