Delete Powerful Offerings to get your stock down to about 60, then load into Altars of Summoning, head to the entrance of the active arena and use the console on the far right to exchange your lower level Offerings for additional Powerfuls (this step can be quickly spammed and should only take a few seconds). Leave the activity and delete the few remaining lower level Offerings and now you’re down to a single stack instead of three. You can then choose to delete what remains over time while loading into activities or just let them disappear on their own when Final Shape launches. Also be sure to remove the Legacy Season of the Witch Artifact if you have it to avoid getting additional Offerings. (΄◉◞౪◟◉｀)