Just use strong op meta picks, pick 2 roles you only play exceptionally well. Spam the 2 champs, 1 for each role. Adapt to the game, don't go with a consistent build path cause that what most low elo players do. Bronze isn't hard to even get out of, carrying yourself shouldn't be a big deal. Know the map, know what's best, mute all players or don't listen to them if you know whats best. Avoid saying "just farm" or anything so obvious, even if they don't listen.
To sum it down. Pick 2 champs, 1 for each role, spam it. Don't build the same thing every game, go with the flow of the game. Play the map (mostly junglers do this, so wards are key). Don't say tilting words. Duo partner is the best way to go, so you don't have to face dynamics.