Webiste Quality Improvement

I am looking for somebody who can improve the Website quality.
Webiste https://www.mamacitastales.co.uk
Domain and Website Builder is with Wordpress Themify
Food Ordering System is with Gloriafood

Here are the issues that need resolving:

Visitor to order conversion
The "See MENU & Order" button should be added to the header and footer navigation so it's visible on any page.
Google Page Speed Test
Your website needs some improvements to run faster on mobile devices.
See what you need to improve
Content optimization
The first H1 tag should contain the restaurant name "Mamacita's Tales".
Example:

Mamacita's Tales

The city name "LONDON" should appear in the first H1 or the first H2 tag of the page.
Example:

Mexican food delivery in LONDON

At least one H2 in the page should contain the restaurant name “Mamacita's Tales”.
Structured data
Schema.org should be added for opening hours.
Schema.org should be added for address.
Schema.org should be added to latitude / longitude.
Schema.org should be added to menu link.

Please get in touch if you think you can help with this.
Regards,
G Nelson