What is your worst luck with artifacts? It could be bad rolls into substats, not getting a specific main stat, or a combination of both.
I may hold the record here. I've been using the Crimson Witch artifact strongbox since December of 2022 as well as going in and out of the domain that has said artifacts, and to this day I don't have a 4pc set.
All I want is a crit damage circlet, and all of the maybe 4 ones I've gotten have had flat & percent health and defense galore. So Hu Tao has been sitting at a 2pc pyro damage bonus since January.
Other artifact sets have taken me a while to get good pieces from. Notably Wanderer didn't have at least pretty good stats like he does now until about 4 months after his release with his set. But nothing like the stupid Crimson Witch.
It's not even just Hu Tao. My Diluc has an absolute garbage crit damage circlet but I just stuck with it because his other artifacts were at least okay. If Hu Tao loses her current circlet, I'll be losing out on 12% crit damage which isn't much, but certainly more that a crit damage circlet with no crit rate substat. So the Crimson Witch set just hates me apparently.