Joomla 3-to-6 Full Upgrade

I need my existing Joomla 3 site migrated to the latest Joomla 6 release while leaving everything visitors already know and use untouched. The current site runs on a standard Joomla template, and I want to preserve its exact design, every page of content, and all active extensions or plugins… (Budget: $30 - $250 USD, Jobs: Content Management System (CMS), CSS, HTML, Joomla, PHP, Web Design, Web Hosting, Website Development)