Provided you have the mechanics, you can climb from Bronze to Gold if you play like this.

1. Get fed.

2. Ward correctly.

3. Help your jungler secure objectives/kills.

4. Take tower (when the time is right e.g. after a teamfight, when you know where the enemy is).

5 Roam to other lanes to take more towers and kills.

6. Play aggro when it's safe to, like when you know you where their team/major threats to you is and you can kill the person you're chasing/flanking in less than the time it takes for their team to get to you. Or if you're fed just kill that person and then their whole team if they come.

7. Go even more aggro in teamfights if they're that bad, or play like a normal adc in teamfights.

8. When you kill enough of them take objectives or towers or end the game.

Obviously this doesn't cover everything but it's sufficient for low elo.

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