I understand your query, so basically there are two methods to convert DBX files to Outlook PST files. First is a manual procedure, it is a very risky method and for this, you require a technical acquaintance but through this technique, there have some hazards of losing our data. The second is a professional manner, there is a tool called
DBX to PST Converter Tool you can use this application as it is 100% safest and cannot risk your data. It is a very simple and stress-free technique to convert your DBX files to Outlook PST.