Marked entire inbox as junk

So because of the option to mark every email as read being right next to the option to mark an email as junk, I accidentally marked my entire inbox of thousands of emails as junk. I went from receiving 100’s of emails a day to maybe 10. I’m missing tons of emails and emails are being returned to senders as being marked as spam. How can I reverse this?  My spam folder is empty on my laptop and my junk folder on my iOS device is greyed out…….I can’t seem to even access the emails marked as junk to reverse this problem. Anyone have any suggestions?

I am also missing a chick if emails. My inbox jumps from 6/4/22 to 3/23/23. How can I get them back?  They have to be in the cloud right?

Just to add…..I only had thousands of emails in my inbox because of another glitch that occurred that downloaded every email that I ever received stored in the cloud back to my phone. I didn’t initiate that download, it just happened.