WordPress Site Speed Optimization

I'm seeking a professional to enhance the loading time of my WordPress site, with a focus on the following aspects:

- All Devices: The site needs to be optimized for mobile, desktop and tablet.
- Critical Pages: The speed enhancement should primarily target the homepage and blog pages.

Your expertise should ideally include:
- Experience in WordPress speed optimization.
- Proficiency in identifying and fixing server response time issues.
- Skills in improving page interaction speed.

Please provide a detailed proposal on how you plan to achieve these improvements.