Platinum 3 Nightmare

I am currently hard stuck at plat 3. I did a more supportive build for Tahm Kench and got a better result. I know it is bad to say this but I think the problem is with my team.

I also am trying out a Korean Meta with Midlane Nocturne and is having a good result. However, even If i make the bot and mid behind, my team ALWAYS seems to get behind as well. I don't know what to do at the moment.