Jovan Popovic has a script to re-create an Azure SQL Managed Instance database which you might accidentally have dropped:
Azure SQL Database – Managed Instance is fully-managed PaaS service that provides advanced disaster-recovery capabilities. Even if you accidentally drop the database or someone drops your database as part of security attack, Managed Instance will enable you to easily recover the dropped database.
Azure SQL Managed Instance performs automatic backups of you database every 5-10 minutes. If anything happens with your database and even if someone drops it, your data is not lost. Managed Instance enables you to easily re-create the dropped database from the automatic backups.
Click through for the Powershell script.