I'll copy paste what I used from the other thread that was a woe is me post. Before that I'll give some insight, if you are able to get these types of teammates, then everyone has a very similar probability of receiving the bad teammates that you do in your elo. Despite that, challenger players can consistently get out of bronze and silver with a near 100% win rate.
Here's my copy paste from the last post, my help if you read it.
Here's my advice as an ex d1 player (this is one of my 4 smurfs). First of all, understand that not every game is going to be a win. Hell I'm playing in gold and I can't win all my games, most of those losses are because I get distracted and play too casual, while a very few minimum are games where I'm placed at an extreme disadvantage. At the same time, however, don't use that as an excuse to give up on games or to ignore your mistakes. "a high elo player lost a few games so obviously there are many games that are un-winnable." When I used to coach I saw this attitude all the time. You should rather be self-conscious, instead of blaming your teammates who play poorly, blame yourself for not properly supporting them. Whatever lane you play, you're objective isn't to win lane, it's to have as large of a positive impact on everybody, as possible. When you play top, you use your tp for bot lane if they get ganked or need help in fights and you constantly roam mid and assist your jungler in invades or when they get invaded. When you're jungle, you simply play well and gank. When you're mid, ROAM. when you're support or adc, win your lane and transfer your lead to other lanes through lane swaps or manpower. (i.e. 3v1 mid, or 3v3 when you have an advantage.) No matter what lane you are, winning your lane by itself is not enough to be a good player. Also, the only elo that meta picks somewhat matter in is master tier and above, other than that don't concern yourself with playing what's meta. Instead, you should be focusing on objectives, you're main priority is knocking down easy, and accessible objectives, and then working your way up from there. The easiest example of this is if you win your lane bot and get bot tower, then since the next tower is so far away and so risky to push for tower damage, you go mid or top instead where there is an easy, obtainable objective that also gives lots of gold for your team. Fix your objective priority and make the most out of getting kills, instead of backing after a kill, roam or get vision control, map pressure, objectives, small gold leads via jungle camps, etc, etc. The reason you are stuck in silver isn't because your teammates are bad, there's only one consistency in all of your games, and if you believe that you are a stuck because of your teammates then ironically pro players who smurf and get to challenger with 90%+ win rates must get the best teammates every game with that logic. Be more self-conscious and constructive of yourself, if your teammates die in a lane, ask yourself why you weren't there supporting them in their time of need. Or if they die to a gank, why weren't you there or why weren't you pinging them or why weren't you tracking the jungler for them. There's always something for you to work on to get better at, but if you spend all your time playing whining about your teammates than you'll never look at the true reason behind your elo, yourself. If you want I'm willing to give you some free coaching if you want to add me on this account. Hopefully, that will open your eyes a bit to the mistakes you're making.