Read more information in detail: https://www.ost2pstwizard.com/
There are multiple third-party tools available on the internet, you just need to find the right solution. You can try Mac OST to PST Converter program which is a very helpful software for data transfer such as email, attachment, etc. The software supports all MS Outlook operating system versions such as 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98. The free trial version which transfers the first 10 items from each folder.
Visit here:- https://www.toolscrunch.com/mac-ost-to-pst-converter.html