And also for reference Microsoft does not support pst files that are larger than 2GB in size, they can be corrupted really easy.
The thing with the PST file is that it is a database file so even if you throw away a multitude of mails from within the PST file the size will still be the same. You indeed have to compact it. This can also be done in Outlook itself ( see info below). But as said, because the file is this large you might corrupt it. I would suggest creating a new PST file and copy information into it until you reach 2GB and then create a new one. Do this until all mails are moved. Even then you might want to try and compact the file.
On the File menu, click Data File Management.
Click to select your Personal Folder, and then click Settings.
On the General tab, click Compact Now.
Click OK, and then click Close.
Make use of Recovery Toolbox for Outlook
Software can be found at:-
https://repairoutlook.recoverytoolbox.com/
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