Just download and try the Cloud Importer tool by Sametools to directly import PST files into an Office 365 account. Refer: https://www.sametools.com/cloud/importer/

If you are looking for a solution to import PST files into Office 365 take the help of MailsDady PST to Office 365 Migration Tool. Using this solution users can quickly upload large-size PST files into Office 365 accounts without hassle. It allows users to transfer multiple PST files into one or more Office 365 accounts at a time.
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Try Softaken Mail Importer Software is an easy method to Import PST files to Office 365 Account. This application imports Multiple file formats to the cloud Account. Users can directly import local Mail to a Cloud Account without any issue. You can upload files in the MBOX, PST, MSG, EML, NSF, OST, and other formats to several IMAP servers. All IMAP Server Accounts, including Gmail, Office 365, Hotmail, AOL, and many more are supported by this software. This application saves the original data Without any error. This software is easy to use by any user technical and non-technical both. Run all Windows OS versions of the utility.

By using the ConverterTools Outlook PST Converter tool to import Outlook PST data to Office 365 and other email clients such as IMAP, Hotmail, Opera Mail, Thunderbird, and so on. It allows users to convert PST files to many file formats for example MSG, MBOX, PDF, EML, etc. with attachments in bulk. Moreover, it is supported with all Microsoft Outlook versions like Office 365, 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97. Futhermore, it permits users to maintain the folder hierarchy as per the original files.
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The Aryson Import PST to Office 365 Tool offers a dependable solution for efficiently importing PST mailboxes into Office 365 admin and user accounts. With a focus on precision and security, this professional program minimizes potential risks during the transfer process. Users have the flexibility to select their desired destination within Office 365, whether it's a mailbox, public folder, or online archive, streamlining the import process. To initiate the transfer, begin by downloading and installing the tool, then select the Outlook data file (.pst) via the "Select Files" option. Sign in to your Office 365 account with Modern Authentication, configure the desired software features, and proceed by clicking "Next." Finally, select the target destination (Mailbox Folder, Public Folder, or Archive Online) and initiate the conversion process by clicking "Convert." The tool ensures a swift and secure import of all your Outlook PST files into your Microsoft Office 365 account.

Use the Manual method to import PST files into Office 365. There two main manual method
1. Network upload method
2. Import/ Export method
They both methods are easy to follow.
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If you are looking for the best solution to import PST files into Office 365, you must try the PST to Office 365 Migration Tool. It imports PST files into O365 without using MS Outlook. Moreover, the tool imports PST files with emails, contacts, calendars, notes, tasks, etc. The remove duplicate option allows users to skip identical emails from the conversion list. Its free demo version allows users to convert 50 emails per folder.