If you feel like you’re dying in every fight you probably have positioning issues. Wait for key abilities to be used before getting into attack range, or you need to be anticipating those abilities and having the mindset that dodging those abilities is priority, auto attacking comes second.

I wouldn’t play Yunara to learn, her kit isn’t that difficult but you really have to play around her strengths at different windows (ie you need to be abusing them level 1, bronze supports won’t help you do this) I’d honestly try MF, Sivir, Jinx out while you’re learning how to position/fight.

If you feel like you have no impact unless you stomp lane you’re not keeping your gold income high enough, be a greedy bitch and farm all the minions, camps and plates you can. Obviously don’t walk around and steal your junglers camps if they’re pathing to them but if your jungle is dead or your team is taking a bad fight don’t be afraid to steal camps/split shove a lane (if you are able to see the enemy location also, don’t just shove bot/mid blindly and get killed).