WordPress Site Error Fix

I'm looking for an experienced WordPress developer to help resolve a critical error on my website. The site currently displays a "This site cannot be reached" message and a 404 error page.

Requirements:
- Must be able to work through TeamViewer
- Experience in troubleshooting and fixing WordPress errors
- Must have full access to the website's server or hosting account

Ideal Skills:
- Proficient in WordPress, server management, and error resolution
- Familiar with common WordPress error messages and their fixes
- Strong problem-solving skills and attention to detail

Please provide your experience and how you plan to resolve this issue.