Thank you! Before I got to that, I checked with my site host (DreamHost), and they fixed it and added the following tip which might help anyone else who is facing this issue.
“If this happens again you can login via SSH and in the WP install folder or below you can run this command:
wp cache flush
That is a wp-cli command from https://wp-cli.org . Very handy for
managing WP, by the way.”
Thank you for your help, @paulwp. I appreciate it!