its because adc needs peel for them and cant make plays directly for themselves, sure you can win lane hard and shut the enemy adc down, but it doesnt get your team mates to leave lane and 5v5 where you should have an edge because you earned a gold advantage and made the enemy adc really weak. but your team mates will still sejuani ult in the other direction, they'll run in 1v5 and die, they wont buy any wards at all, somehow the enemy team will manage a 4man gank bot lane and your sup is oom for some mystical reason.
so what it really comes down to are you prepared to 1v5? no? then you need a team to win the game. and just straight up the only way to leave silver is with sheer number of games plays. thats it. you hope theres an equal amount of feeders on red/blue and you get feeders in promos 50% of those games and great, you just went up.
people in silver are capable players, they just dont work well together or understand the concept of grouping/objective taking. its beyond them, thats why they're in silver.
the difference between low gold and silver players is just cs, thats it, its the same skill level.
for the longest time my MMR was gold level but i couldn't leave silver 1 because i couldn't win 4/6 games, i would constantly get sent back to promos lose 3 and have to climb a bit again. i was consistently playing with g3 players on both sides myself being s1. this was because that was my skill level at the time and all ranked games are based on MMR.
(what logic is it that if im silver 1 promotional matches that the other 9/10 players are all gold 3 players) asking me to win 4/6 games at the g3 level would mean that im effectivley higher than g3...... not just silver 1.
check your MMR rating on na.op.gg then check yourself during game loading on lolnexus.com and see what division/league everyone in your match is in on your smurf.
