Trying to reach plat but bad things are happening ( need advice )

Tea Time Twitch - Summoner Stats - League of Legends
Tea Time Twitch / Gold 1 30LP / 90W 89L Win Ratio 50% / Twitch - 32W 25L Win Ratio 56%, Evelynn - 22W 13L Win Ratio 63%, Jinx - 15W 17L Win Ratio 47%, Vayne - 4W 10L Win Ratio 29%, Master Yi - 7W 4L Win Ratio 64%
So im doing my third plat promo this season. (disclaimer: this isnt meant to be qq and more of a serious question) I have a perfect 50% winrate (sadly) but im kinda improving and doing my best as Jungle and Adc Main. Every game i start i get atleast someone flaming (well thats fine just mute i guess) {{champion:32}} {{sticker:slayer-jinx-unamused}} - if that would be the only problem. Im already trying to dodge bad games and play with a premate...(check my recent games and look out for my teams of literally every game ive played today) As i said this isnt meant to be a qq thread and more of asking for what i could do or improve to either avoid or carry these situations a bit more. im trying to stay calm and concentrate while focusing on carrying. The 37/10 evelynn game i had it was literally only me and yuumi (premate) playing but one mistake and a backdooring teemo costed us the game. The 1/18 yasuo didnt improve the whole situation and flamed like a madman. It seems that duoing with my silver friend (see increases the chance of encountering a "weaker" teammate by atleast 30-40%. At this point its literally ALMOST every game for atleast a week.{{sticker:sg-ahri-1}} Any ideas or guesses? (i had a few rare games inbetween that went well with an awesome team - the tristana game for example) {{sticker:sg-zephyr}}
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