Alright I'm gonna start by saying I'm not good, but I got from Bronze I to Gold V in 94 games as a jungler, so I know exactly what you're going through.
I don't think you'll like this answer, but it's the truth.
If you're better than the people on your team and on the enemy team, you can carry the game. This game in particular looks like the fed people on your team got too confident/cocky and threw, it happens. The thing is you don't gain elo by doing well in one game then using it as proof that you can't carry. You need to get your teammates/yourself that lead every game, some games the teammates you get fed aren't that good and they'll fail to carry you and more often than not, they will.
The thing about low elo teamfights is that hardly ever is someone actually doing what they're supposed to be doing, but if you are, or at least more right than them, you can make a bad fight into a good one. If you try to dissuade your team from a bad call and they don't listen, go with it, it's better for everyone to follow a bad call than to have half the team doing one and the other half doing the other.
My rule of thumb is if I make any mistakes in the game, I can't blame anyone but myself for not winning. If you don't see any mistakes, look harder, they're there. Try to apply your mistakes from the last game into the next and try not to do it again. You really don't need an amazing team to gain LP, you just gotta work on yourself and it'll happen. Also, I recommend you keep trying with J4 ;) he can do wonders, and he's simple enough where you can focus on map movements and objectives instead of difficult mechanics.
Edit: Camping bot or mid is your safest way to victory, they influence the map and teamfights the most. You can sometimes pick up easy kills top if they don't have flash or if they overextend, however.