WordPress Error Troubleshooting

I'm facing issues with my WordPress site. Error messages pop up when I'm trying to save pages, and my media library refuses to load. I've already attempted some troubleshooting steps by deactivating plugins, but the problems persist. I have back ups but am getting error messages when I try to load using UpDraft. The websites are static/CV style so I don't mind if they are stripped back to older versions.

Ideal skills and experience for the job include:
- Proficiency in WordPress troubleshooting
- Experience with error message diagnostics
- Skills in optimizing media libraries
- Familiarity with plugin configurations