Optimize images: reduce size, use WebP format.

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Don't forget about alt and title meta tags for images. They will help you get into image search.
Simplify the registration form, leaving only the most necessary fields. Entering data from a mobile screen is not always convenient. The best option is the ability to log in to the site using a phone number and a control code via SMS.

Optimizing Your Website for Mobile Devices: A Detailed Guide and Checklist Pin important sections (such as the catalog, cart, and personal account) at the bottom of the page so that the user always has quick access to them.
Optimizing Your Website for Mobile Devices: A bahamas whatsapp number data Detailed Guide and Checklist Make phone numbers, contacts in messengers and email clickable. This will make it easier for users to contact you.

Mobile Website Optimization Checklist
Use responsive design to automatically adjust to different screen sizes.
Minify CSS and JavaScript files.
Use caching and CDN to speed up loading.
Make sure the menu is easy to access and navigate.
Make sure buttons and links are large enough to click.
Use fonts that are easy to read on mobile screens.

Make sure the text is not too small and contrasts well with the background.
Break long paragraphs into short, structured chunks.
Optimize your contact page: use clickable links, add a map and directions.