I had the same problem as you, and I used SameTools PST Password Recovery Tool. This tool is very simple and shows the password in a few seconds, no matter how complex it is. No technical knowledge is required, and there is no damage to the file.
Key Benefits:
Recovers old or forgotten passwords instantly
Supports all versions of Outlook 2019/2016/2013/2010, etc.
User-friendly and secure
You can try it here: