What to do leading upto season 4

Hello,

This is my first ever Diablo game and im quite enjoying it.

I just finished campaign and went to world T3, which is pretty tough but fun.

My main question is that I read that in season 4 the way you get items is supposed to be getting a massive overhaul, should I be keeping items til then or just salvage/sell until season 4?

Also, anything else I should know or be doing up until then?

Thanks.

Ah okay. Thank you very much.