Cloudflare & Caching Setup for WordPress

I'm seeking an experienced developer to resolve my site's caching issues and configure Cloudflare and Seraphinite Accelerator. My site is currently experiencing 500 errors and caching problems, possibly due to misconfigured HTTP headers.

Key Requirements:
- Fix 500 errors, potentially linked to caching issues.
- Configure Cloudflare for my WordPress site with Elementor.
- Adjust the following headers for proper functionality:
- Content-Security-Policy: Site functions stopped after my attempt to configure.
- Permissions-Policy
- Referrer-Policy
- X-Frame-Options
- Optimize setup for performance and security, ensuring no cached content is delivered inappropriately.

Ideal Skills & Experience:
- Proficiency with Cloudflare and WordPress
- Strong understanding of HTTP headers and caching mechanisms
- Experience with Seraphinite Accelerator and popular caching plugins like W3 Total Cache or WP Super Cache
- Problem-solving skills to address and fix 500 errors
- Knowledge of security policies for web applications

Please provide examples of similar work done and your approach to this project.