- What is the issue you are facing?
 - Performance?
 - Sizing?
 - Cost?
 - Data Model?
 - Backup/Monitoring/System?
 - Security?
 - What is the current sizing in GB of the database?
 - What MongoDB version do you use?
 - What storage engine?
 - Do you use Replica Set?
 - Do you use Sharding?
 - How do you backup your database?
 - Where do you host your servers?
 - What is the sizing of your machines (CPU, Disk size and type and RAM)?
 - Do you have any monitoring traces of your machines (CPU, disk usage and RAM)?
 - Did you implemented indexes?
 
Keep Performing