Card Cannot be Acessed

I know this has been asked before and I have watched through YouTube and read the posts for the "Card cannot be accessed. Reinsert/change card ". I have a Rebel T6, which was shooting great last night and then this afternoon I received the error. Ive tried 3 SD cards, one 64 GB and two 128GB (non-micro). All are in the unlocked position. Ive tried formatting them while in the camera and gotten the "cannot format card" error. I blew into the slot, took out and reinserted the battery, and nada. Ive used all 3 cards before and just wiped them all recently. I transferred photos this morning to my phone. I travel full-time and I'd rather not have to bring it in to a camera repair shop. Any hidden tricks that have worked that somehow no one has shared? Id be eternally grateful!