Drupal 7 to Latest Version Migration

I need to migrate my website from Drupal 7 to the latest version of Drupal. The site is yourtown.com.au.

Requirements:
- Rebuild all pages in the latest Drupal version
- Maintain existing third-party integrations and APIs
- No new features or functionalities to be added
- All original assets (images, videos, documents) are available

Ideal Skills and Experience:
- Strong experience with Drupal migration and site rebuilding
- Familiarity with third-party integrations in Drupal
- Ability to ensure a seamless transition without losing existing functionality
- Prior experience with yourtown.com.au would be a plus

Please provide an estimate of cost and time required for this project.

Please check the website to see how big the effort would be yourtown.com.au