The OST file is an encrypted file, It is a replica of your online mailbox; you cannot import or point the inaccessible OST file to the same or another Outlook account in any condition. Things you can do: If you have a backup of your mailbox, you can import it into a new Outlook profile though Import and Export Wizard. But in case of any discrepancy on the backup PST file, such as a missing folder or items missing rules, calendar, contacts etc. You use the local save OST file, convert it to PST file format through third party tools such as removed by moderator
That will help you to restore, you’re all rules, missing items, and deleted items that in the new Outlook account.