Solo Carrying.
You cannot trust your team to do ANYTHING in this ELO. You need to powerfarm early, avoid engages unless your jungle is there, just focus on getting 75+ CS by 10 minutes. Harass with Q, as MF eventually the enemy will get hit by a Q-crit because they do not know how to avoid it in silver. DO NOT go into full-on fights. If your support engages into a fight that you know you'll lose, don't go in. They'll flame you, who cares, it's better to feed one kill than two kills. If you see a fight you can win, ping support and go for it, or ask for jg gank. Farming is the only source of reliable gold that you can get in this game besides the passive gold generation, so practice it constantly. Enemy ADC could be 3/0 and you could be 0/0, but if you have 50+ CS more than them it doesn't matter because you both have the same gold.
Also KEEP DISTANCE. Know how much range their enemy support has. If they have an all-in like Leona/Thresh/Blitz, DO NOT facecheck anything, don't go near bushes that aren't warded. DYING IS THE WORST THING THAT CAN HAPPEN TO YOU. Keep that mindset. Missing 5 CS, 10 CS, 20 CS, up to 30 CS is better than dying. If you die, they get 300 gold, assists gain 150-ish gold, and the ADC gets free farming time (which could be another 100+ gold, 200 for cannon waves).
In teamfights you need to ALWAYS stay by someone. In silver people will pick assassins every single game because they are trying to cheese a victory out of the meta. Stay by teammates, constantly. Your goal is to not die, don't feed any gold to assassins. They are ridiculously broken in silver because nobody knows how to play against them, but the players know how to play them relatively well. The easiest form of counterplay is to stay grouped. Ask yourself always "If an assassin came for me right now, would I die?" If so, back up. Also focus on closing out games faster, meaning take dragon, take towers when you can, take inhibs (bot inhib most important), take baron.
In terms of tilt, I have a system I usually follow.
If I lose one game, I take a 15 minute break and come back.
If I lose two in a row, I take a 2 hour break and come back.
If I lose three in a row, or if I lose more than four out of seven games, I stop for the day.
Sure you aren't playing as many games but a game where you're tilted is an instant loss. Remember YOU are the ONLY person you can count on. You'll win more if you have a fresh mind. Remember every game is a new game, with new players. Don't be afraid to dodge. If you have no tank and they have 2 or more, dodge instantly. If they have 4 AD assassins, dodge (the armor you build as an ADC will do nothing). Ask "if the game goes for longer than 20 minutes, will they outscale us?" If it's yes for at least 3 of them, dodge. Losing 3 LP is a lot better than 20 LP. Also dodge if someone threatens to int/is super toxic.
It does come down to luck somewhat but remember, they have 5 players that could feed/afk, and you only have 4 (assuming you don't int). So it is generally in your favor. Good luck, I'm S5 myself and I get it.
