There are two ways to repair the corrupt PST file: the first is a free method (ScanPST.exe), and the other is a paid tool to repair the corrupt PST file. Read More: https://www.stellarinfo.com/outlook-pst-repair.php
To run the ScanPST.exe (free tool), You can locate the scanpst in your system by following the shared below path. Office 365\2019\2016: For 64-bit Outlook C:\Program Files\Microsoft Office\Office16
After opening the tool, follow the shared below steps:
• Close Outlook.
• Open ScanPST.exe.
• Browse to the location of your corrupt PST file.
• Start the scan.
• Repair any errors found.