In my opinion (I am platinum since season 4), there is different strategy to climb efficiently at different elo (bronze/silver) vs. (gold/plat). -Not even mentioning Diamond and above, I never played at that level anyway.
In Bronze/Silver, you need to carry to have a >50% winrate: you need to snowball and take objectives.
You can't play a utility support or a utility tank which rely on your team. But you can play Annie support and snowball, for example.
In Gold/Plat, it is harder to stomp a lane and snowball by yourself, but utility support / utility tank become strong, because you can rely on your team.
This is personal: this is what works for me. It is different for everyone. Maybe you belong in Silver atm, so just keep playing and improving, and as you improve, you'll climb. =)
I would be interested to see statistic about the most popular role of each elo!
I would expect mid/top to be popular in bronze, and support/jungler to be popular in diamond/master.