Urgent Fix for Mobile banner issue

My Shopify store, built on the Dawn theme, Project Description:

Client: KaviPushp
budget :- 300 -400 rupees

Tasks:

Implement a separate mobile banner code on Shopify.

Make images clickable.

Set a serif family font as the default font.

Perform minor changes on the Shopify website without affecting speed or functionality.

Requirements:

Proficiency in Shopify development.

Experience with custom coding and Shopify themes.

Ability to maintain website performance and functionality.

Preferred Skills:

Knowledge of Liquid templating language.

Familiarity with SEO best practices.

Responsive design experience.