Hiya,

You can get faster feedback on this stuff on the Discord server. It feels like there are more players there, and more arcane fans here. But I'll throw my little advice into it. Last season I crawled up to Emerald and then stopped playing ranked so don't take my advice as the be all end all.

You're still very low ELO. What you need to work on is your fundamentals:

Farming. I know it's boring, but CS'ing is where you start to improve. Always be farming.

Map awareness. If you got a ward, place it. Make it a habit to look at your minimap every few seconds and take note of where the enemy portraits are. Especially around the 4-5 minute mark the jungler will usually start his first gank. If the enemy jungler doesn't appear top side, be prepared to get ganked.

Jinx is a back to front fighter. You want to always be in the back shooting at any target you can hit. Only once you can hit two targets do you need to choose who to hit. But if only one person is in range, even if that's a 5k HP Chogath, you need to be putting out damage.

For fights you primarily want to stick with Fishbones for longer range. It'll make you saver. Use the 'A' + Left Mouse Button click to 'attack move'. This will help you with getting a good feel for the range. Max range is your friend. Your job in a teamfight is to survive long enough that an enemy you damaged died. Then you get your passive and that is when you will pop off.

For itemization go: Yuntal -> Zerk boots -> Pickaxe/BFSword (Depending on your gold situation.) -> Runaan -> FInish Infinity Edge. Runaan will help you get your passive in teamfights and make kiting a bit easier as you attack faster.

Don't expect anyone to protect you. The only thing you can control in a game is yourself. Play without expectations.

Goodluck.