We know that there is some limitation of storing data in a PST file due to which the user has to face this common problem. Data up to 2 GB in an ANSI file and 20–50 GB in a Unicode file can be stored. I would like to suggest MailsDaddy PST Split tool, through which you can easily convert a single or multiple PST file to two or more PST file. It is an all-in-one solution that allows to split a PST file according to date, year, size or folder. There is no file size limit for both Unicode and ANSI.
For more information: https://www.mailsdaddy.com/pst-split-tool/