You can easily import OLM file to Outlook PST then you can try any commercial solution like Softaken OLM to PST Converter. This software allows the user to maintain OLM items such as emails, notes, tasks, journals, folder, subfolder, contacts, calendar, and etc. The software has an excellent user interface, making it simple to comprehend and operate the tool. Refer:- https://www.softakensoftware.com/olm-to-pst-converter.html
Use this excellent Vartika OLM to PST Converter software that can export single or multiple OLM to PST format in just single way. It allows the User Export the OLM file to PST and Multiple file types such as HTML, MBOX, EML, PDF, vCard, EMLX, MSG, and vCal file type. The OLM to PST converter can Export OLM files to Office 365 and a Live Exchange server safely. It Export the OLM Contacts and Calendar to vCard and vCal files.
Know more info- https://www.vartikasoftware.com/product/olm-to-pst-converter.html