If you're looking for a more structured approach, the Aryson Import PST to Office 365 Tool is one solution that simplifies the migration process for both technical and non-technical users. The software allows users to import single as well as multiple PST files directly into Microsoft 365 mailboxes without requiring Microsoft Outlook installation. It supports both ANSI and Unicode PST files and works with PST files. https://www.arysontechnologies.com/blog/how-to-upload-pst-into-office365/