help migrating multisite

Hello!
Could you help me doing the migration of a website? (if yes, I'm sending you all the details and permissions to access via ftp and sql )
I migrated a domain and the previous isp (once completed the migration of the domain) deleted all the files in the hosting service.
Fortunately I have a backup of all the files and a backup of SQL database.
I tried to upload everything in the new hosting service (updating the informations about sql, ecc...) but it doesn't work! When visiting the page i receive "impossible to reach the page".

I tried migrating a different website (also in wp) and it worked.. Could you help me with this problem?
At the moment I set a redirect to another website..

Thank you in advance