How to Repair a Damaged Outlook PST File:

Use the Built-In Repair Tool (ScanPST)
Outlook includes a built-in tool called ScanPST (Inbox Repair Tool) to fix minor PST file corruption.
    Locate and run ScanPST on your computer.
    Open the tool and browse to find your damaged PST file.
    Click Start to begin the scan and follow the prompts to repair the file.

Create a New Outlook Profile
If ScanPST doesn’t resolve the issue, try creating a new Outlook profile. This can help if the corruption is tied to the user profile rather than the PST file itself.
    Go to Control Panel > Mail and click Show Profiles.
    Select Add, create a new profile, and set it as the default.
    Reconfigure your email accounts and attempt to import the PST file into the new profile.

Restore from a Backup
If you regularly back up your PST file, restoring from a backup is the quickest way to recover your data.
    Navigate to your backup location and copy the most recent PST file.
    Open Outlook and use File > Open & Export > Open Outlook Data File to restore the backup.

Contact Microsoft Support
For severe corruption that cannot be fixed by the above methods, reach out to Microsoft Support for assistance. They may have additional tools or solutions for your issue.

Use Third-Party PST Repair Tools
If the built-in repair options fail or the corruption is extensive, consider using third-party software to repair the PST file. Reliable tools like GoldyTools for Outlook PST Repair or similar options can help recover data from severely damaged PST files. Ensure you use well-reviewed and trusted tools to avoid further complications

https://www.goldytools.com/outlook-pst-repair.php.