Hit a wall at level 83

Hello everybody,

Newbie here and this is my first league and i would appreciate it if someone can
anyone help me figure out what i'm doing wrong.
I followed the templar guide from asmodeus using the armageddon brand build.
At first it was really fun and i really enjoyed the build until the end of campaign.

https://pobb.in/q6Caf-7HzcSY

But when I Started maps i frequently die specially on T8s. Can't level up now because i'm dying frequently.

At this point i'm stuck and don't know what to do next.
for the past 5 days i felt like i'm not improving. I really love this game and i want to succeed using this build.

thanks in anticipation.