I've noticed that every time I get artifacts I dont get weapons. Maybe get only 1 weapon from 20 or 25 artifacts that I could buy in 1 day. I want to improve my weapons but Im not getting them. Im tired of getting jewelry and ceramics all the time.
Do not open one by one
save them and open multiple one time per week for a better chance at weapon artifacts. And save only the one that gives you 6% or more