What you have to do is, first don't get discouraged by bad luck, people dcing or trolling. Those things happen, even in plat and low diamond.
Second, focus on becoming amazing at your primary lane, so amazing that you will crush your opponent the vast majority of the time and if you get hard countered either you outplay him or you roam.
Third, is that you need to roam anyways. League is a team game and part of you carrying is getting the rest of your team gold as well.
Fourth, and one most people forget, is that the ENTIRE goal is to destroy the enemy nexus. Getting cs, getting kills, even getting dragons, won't finish the game, they are all just a means to an end. People in silver usually get too focused on getting a good score and kda and they would rather fight exciting fights where they do some awesome outplay and kill most of the enemy team, except they aren't good enough to do so, and then you guys end up losing a team fight and losing your nexus. Focus on doing whatever it takes to kill the enemy towers to get to the enemy nexus, everything else will come more naturally if you do that.
Fifth, you need to become the leader, or if someone else on your team is doing a good job of leading, let him/her lead and don't fight for that position. Telling your team what to do and doing it well will change a 5 person SoloQ from looking like a drunken mess into at least a partially coordinated team. This way your team can come together and get goals and objectives more easily or be in better positions to win crucial team fights or contest important areas.
This is what I did you get from S4 to P5 this season in just over 200 games SoloQing.