If you are around that Elo then you will stay in Silver. It is pretty simple. If you are better than your peers and consistently play well you will have over a 50% win rate to move out.
Basically, you can't have bad games ever. The worst your game should be is "even" for your lane.
Things you can do in silver to win more:
Play only 2 roles in ranked
Play only 2 champions in each of those roles
Never chase kills and focus taking objectives instead of chasing after an enemy dies. After someone dies always ask yourself "Can I take an objective?" If the answer is know keep doing whatever you are doing. If you can always try to take it and ping for help.