In my opinion Ez isnt the greatest ADC to carry with in low ELO but he is fun so do what you gotta do, maybe look at picking up lucian or tris though.
Yasuo is a strong pick but I think unless you are mechanically quite good you shouldn't pick him without another source of knock up in your team because often proccing 2 Q's in a fight is difficult and and takes too long. Also he did recently get nerfed but in honesty it only really affects him in lane very early.
Garen is strong atm. Buy warmogs and roll face - you can push top and stay there all game, at some point you will be tanky enough and regen enough hp out of combat that they wil probably need to send 2 people to deal with you, at which time you want to be pining your team to push somewhere else or get Dragon. Gragas is also a good toplaner IMO but don't build him full AP. He is better played as a disruptive tank as he offers a shitton of utility.
If I were you though I would try to get jungle and carry yourself out of silver that way. Early this season I came through bronze and silver in the jungle playing mainly Vi J4 and Lee Sin. Vi and J4 are very strong picks in any-ones hands to be fair, provided you are decent with decision making. If you get fed on Vi you can quite literally 1v9 carry the game & building her full on assassin is awesome fun. Lee Sin is super strong but out of the 3 I would say he is the hardest to play well. He does require an element of mechanical skill if you want to be making flashy plays, but to be fair you don't need to make flashy plays in 9 out of 10 games - I got caught out with this a lot and was too focused on trying to make crazy plays and insec EVERYONE ALL THE TIME, then I realised that I was being a noob and now I win a lot more lol. Kha'Zix is also a great pick.