can anyone tell me why i never got artifacts set or 4 stars artifacts even if i already defeat lvl 41/lvl 50 bosses

can anyone tell me why i never got artifacts set or 4 stars artifacts even if i already defeat lvl 41/lvl 50 bosses like literally so many times but i never got four stars artifacts as a reward😩 now i’m ar 30 and barely hanging because i only do 300 to 500 dmg pls

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