AWS FreePBX migration move cloud server

We provide cloud-based VoIP services for a small hotel in the US using AWS as our cloud service provider.
We have two AWS accounts, one named “Legacy_AWS”, the other “New_AWS”
Legacy_AWS has a server, named Hotel_FreePBX_13, running FreePBX, configured, and providing service to the hotel.

We need to migrate that server from “Legacy_AWS”, the other “New_AWS” and would like an expert to lead the process and be assisted by our two sysadmins.

Overall we will make preparations for, and then:
1. Execute a pre-migration performance check on the Lakeside_Inn_FreePBX_13 running on Legacy_AWS
2. Cutover
3. Execute a post-migration performance check on the Lakeside_Inn_FreePBX_13 running on New_AWS

Then if needed:

4. Fallback
5. Execute a post-fallback performance check on the Lakeside_Inn_FreePBX_13 running on Legacy_AWS
6. Make necessary corrections

We need an expert to:

1. Document the procedure to migrate (noting configurations/SIP changes etc.)

2. Support our sysadmin to perform the cutover, and if needed the fallback (about 1 hour)

Thank you