Optimize High Resource Usage WordPress Site

My WordPress e-commerce site on Hostinger Cloud Enterprise is experiencing high CPU and RAM usage, especially when it exceeds 80%, leading to database connection errors. I need an expert to diagnose and resolve these issues.

Requirements:
- Assess current resource usage and identify bottlenecks
- Optimize existing performance plugins or recommend effective alternatives
- Implement solutions to reduce CPU and RAM usage
- Ensure site stability and improve loading times

Ideal Skills:
- Strong experience with WordPress, especially in e-commerce environments
- Proficiency in server management, particularly on Hostinger
- Knowledge of performance optimization techniques and tools
- Ability to troubleshoot and resolve database connection errors

Please provide a brief overview of your approach and relevant experience.