how to end a Losing Streak?

Since a few days i have a big Losing Streak (15 Games now),because of that i dropped from Gold4 to S1. I dont flame and muted the /all chat,but even that isn´t enough. As a Supp i try to ward as much as i can,but the enemy Bot is always better,or their Team. I took a break and played with fresh power,and the first game was a lose (again). What should i do now? i get only 13+ LP (now only 10 i think) I dont have premades to play with,so its rly hard.... do you have any advice how to end this? normals are boring for me...
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