One can simply download NSF to PST converter software from the official website of eSoftTools. A free edition is available on it. It has the capability to export the Lotus Notes database from the NSF file into many different file formats with an option to select some items of the mailbox or entire database. It is able to convert NSF file into PST, EML, EMLX, MSG, vCard, CSV, MBOX, HTML, etc.
For more information:- https://www.esofttools.com/nsf-to-pst-converter.html