Fix Wordpress 7.0 Website Issues

My WordPress website is malfunctioning after updating to version 7.0.

Key Issues:
- Plugins are not functioning correctly, disrupting overall website performance.
- Sidebar is non-functional.
- Design/Layout issues including:
- Incorrect positioning of elements
- Broken layout on different devices

Ideal skills and experience:
- Expertise in WordPress, especially with version 7.0
- Strong knowledge of plugin compatibility and troubleshooting
- Proficiency in responsive design to fix layout issues across devices
- Experience with debugging and resolving WordPress site errors

We would like this issue fixed as soon as possible.