That sucks this close to harvest buddy!
Depending on the volume of infestation, I’d check each plant and try to limit any contact of leaves so this doesn’t spread throughout.
Maybe consider washing the buds that are effective, although this could result in loosing some of the Terp’s and tri’s, at least it will remove the mites before drying.
Not sure if anyone else has any other options on this, that’s the best I can suggest bro!