Stuck in bronze

So i've been playing the game for a few months now and have around 800 ranked games under my belt, but i'm still in bronze. I've read alot of guides and watched some pro games and tried to learn, but it just seems like I'm missing something. I feel I do decently in lane most of the time compared to most bronze players, but it just seems like half the time i just cant carry the team even if i do well.

I know a lot of people complain about this, and some say it isn't the problem, but it does seem like there are just a lot of really bad players and trolls in bronze. I mean a few games ago I had a jungler who didn't take smite OR buy a jungle item. When i said he should get a jg item he said he didn't need one because he was "just ganking alot". The other day i had a game where i ended 5/2 and my team ended something like 3/10 on average. I've a had a game where I've gone 17/0 and lost. These are just a few examples.

I main mid, and when I'm in lane i focus on just out-csing my opponent and poking them when good opportunities arise. I win my lane 9/10 times, but it isnt enough. I've heard people say that if you just win your lane consistently you should rank up. But i do that and it isnt enough.

So my question is should i focus on roaming more early game? I do roam sometimes but i dont do it too much because when I roam I lose cs. And if I gank for another lane but then they still continue to feed (which happens alot), then I basically just wasted time and lost cs for nothing. So should i just play some strong early roamer like katarina and gank a lot to carry myself out of bronze? Or should i just focus on farming even better and winning my lanes even harder? Any tips would be appreciated and feel free to add me in game.