u/Bulgork

Hello there, ive been playing a kboc necro as my league starter. So far it was good, but it feels like im missing something obvious that im just too blind to see to make my build better.
Ive been farming boxes without any issues but i want to try the expensive breach stuff and im pretty sure my build isnt ready yet to do it.

So the question is : is there something obvious i can improve easily ? If no then what should be my next upgrade ?

Here's the pob : https://pobb.in/wQkI_b3xDpBL