abstract fox
I have unused mythic Artifact boxes and soon to have more before the season ends again. I cannot use them because I have purchased all the legendary artifacts. I also have 11 Epic boxes which again, I cannot use because I have all the epics. Will have more of those boxes before the season ends. I have 19 Soul imprints which I also cannot use because those Legendary Hero's are already max inspired.
You should create an upgrade process. For example. Mythic Artifact boxes being able to upgrade to Exclusive Artifacts box of your choice for the Exclusive Hero's. Epic boxes being able to be upgrade to Legendary Hero's. Sole Imprints being able to be upgrade to Exclusive Hero's of your choice.