Blightlord set with fire

https://www.grimtools.com/calc/qNYoaxXV
To start I will say that I was looking to focus more on fire and burn more than Vitality.
I thought that if I focus on the guardian and combo with ravenous.
I feel very squishy but can kill, little like a glass cannon.
I have necrosis on and use it with eldritch fire, thought it would be a good combo.
Have I enough RR or not enough?
What have I done wrong if anything and can I change something to make it better?
Happy for a few ideas because I’m all out, I need a new perspective.