Please at least play how your champion is intended for your team.

If they have a strong early game, play more aggressive, don't sit back and just afk farm. IF they are very weak in the early game, don't try and force fights unless you have a significantly clear advantage. If you are the team's main engagement, don't wait around for others to do it for you. Start those fights. If you are the team's tank, tank. Don't hide behind the other, more squishy champions.

For the record, I am not saying who you decide you are going to play with when I say tank. I mean you have actually decided to play the official "tanker of all the damages" for your team. Not the "you are playing a beefier champion so you automatically are the tank" kind of deal.