Moving A Site
There are two reasons people move. Either the platform costs more than it returns, or somebody else owns the account and leaving is being made difficult. Both are common, and both are fixable.
A migration is not a copy and paste. Pages get rebuilt properly on the new platform, and every old address gets pointed at its replacement so the traffic and the rankings you already earned come with you.
Redirects Are The Whole Job
What kills a migration is not the design, it is the addresses. If your old pages vanish without a forwarding address, search results that took years to earn go to nothing, and the drop shows up about three weeks later when it is hard to undo.
So every old address is mapped before launch, the old site stays running until the new one is verified, and Search Console is reconnected and the sitemap resubmitted on the day of the switch.
The Domain And The Email
Both move at no extra charge, and both end up in accounts registered to you. If your domain is currently in a developer or an agency name, that is the single most important thing to fix, and it is usually the thing they are least keen to help with.
Email is tested before the switch, not after. Losing a day of a business email is not an acceptable cost of a website change.
Whether To Move At All
Sometimes moving is the wrong call and rebuilding where you are is cheaper. Sometimes the platform is fine and the problem is what was built on it. The audit answers that for three hundred dollars, and it comes off this price if the answer turns out to be move.