Be a leader, ping and ward. Play someone with CC, a carry who is stunned in front of your teammates is pretty universal. Push down towers midgames, and WARD. you don't ward, you get caught, people think you're bad and then people don't listen to you when you want to force objectives.
Play a bruiser if you don't think you can trust your teammates.
splitpushing is done if you have the right team for it AND you aren't able to kill towers or win 5v5 teamfights.
Elo hell does not exist, CS better and dominate your lane. Turns it into a 4v5 until lategame.
There's is something you can always do.
Force your opponent to back, eat pots and gank mid.
Ward their jungle, and kill their jungler, steal buffs.
Force their jungler to gank you, so your other lanes can free farm.
Play someone you know how to play.
If you're getting 80-90 cs and getting kills for your teammates, and downing towers early so you can roam and successfully do so, well. You'll win most games like that.