I need Yoast SEO Optimizer with White Hat SEO skill to Rank my App Site and Service On Google Front Page!

I need SEO Optimizer to Rank my Site and App Service On Google search Front Page! The only keyword which is highly ranked is 'email verifier pro' but I need more relevant words keyword ranking, based on competitors domain names or relative words which users use as focus keywords.

Site: https://emailverifierpro.app
Product site: https://codecanyon.net/item/email-verifier-pro-bulk-email-addresses-validation-mail-sender-email-lead-management-tool/24407503

I need someone who can discuss this with me in-depth for the best solutions.
I bought a domain that is one month old.
I need you to research my product and competitors
Modify content and descriptions for targeting audiences through organic keyword searches.
Find the best competitive keywords, content and descriptions and assign them.
Modify content on my landing page to increase SEO rank in Yoast and Codecanyon product page.
I don't have much of a page. Main 2 page which needs this adjustment.

Apply answering with How much it will costs for you in total to bring more organic visitors to my site and having a well-established search ranking? How long it will take?

Anyone with prior highly knowledgable in Wordpress yoast, and white hat SEO is welcome to apply!