I removed the certificate and then added it back, and now all of my studies are able to access the server again. Not sure why this happened in the first place, but thanks for your help!
Thanks for the quick response! I clicked on the link and the details under Advanced said that the certificate expired four days ago. I checked in DreamHost though and it said the certificate I have (Let’s Encrypt Certificate) is good until 06-17-22. Do have any idea about the reason for the discrepancy? Or is there a different certificate I should get?