without the O365 ( Office 365) Global admin right you are unable to explore more function at Microsoft 365 admin center
as i have notice microsoft have free trial offer 1 year for Office 365 developer program , you can register the program and get the free trial at office 365 as Global Admin ( you can try what ever you want at the O365 , off course not include those premium service)
This program have up to 25 Office 365 Enterprise E3 Developer License , which is allow you to play around the product :
- Exchange Online
- SharePoint Online
- Teams Online ( take over Skype of business )
- Azure Active Directory
- other ...
Here you go for the URL : https://developer.microsoft.com/en-us/office/dev-program
have fun about it to ready your self for Cloud SaaS generation !!