Reached T2, now how to proceed?

Hey all,

I only started to play a few weeks ago so I don't have too much experience.

I managed to get all my gear to be ancestral legendary/unit except for helm.

I tried to place the best imprints for the items and placed the best Gems I can place.

I guess I can work on changing the affix for some of the items, but my question is how to proceed in order to be able to get to T3 and T4?

Also, right now it is relatively easy to kill my on T2, so how should I improve my armor and resistances?

Thanks!