WordPress Site Improvement

I need help with my WordPress site.

3 Problems need to be fixed.

1. change header menu.
2. update service page content.
3. Email Delivery problem solving.

Key Requirements:
- Theme customization
- Plugin development
- Site optimization

Ideal Skills and Experience:
- Proficiency in WordPress
- Experience with theme and plugin development
- Strong knowledge of site optimization techniques

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

I prefer new freelancers with experiences in WordPress.
Write "New" word in front of your proposal.

Hope to work with excellent developer.