Data Migration from azure devops serveer to new one

I have a problem in data migration from Azure DevOps server to the new one

in my case, i have a split database on a different machine. So, I have two environments: each one contains a devops server and database in splitter machines 

i want to migrate the whole data from different tools to a new one

and the problem is as the organization roles i do not have all administration privileges on databases and devops machines

So, I want a determined way to get the whole data from the old one to the new one (especially privileges that are required to ask the admin to give me ) with clear steps