You have accidentally removed or deleted your Outlook account. And now, you’re looking for an effective method to restore your deleted account.

Steps to Restore Removed Outlook Account
Restoring a removed Outlook account follows a simple step-by-step procedure. Following these steps will allow you to retrieve your deleted account without any conflicts.

First of all, you need to go to the folder where Outlook data is stored on your computer. Generally, the location of MS Outlook in Windows PC is:
C:\Users\yourusername\AppData\Local\Microsoft\Outlook
Here, copy the exact name of the PST file that was linked to your deleted account, as you will need it in the next steps.
Note: You can also copy the PST file and save it to another location, where you can locate it easily.
Now, launch MS Outlook on your system and go to the File tab.
From the File menu, click the ‘Import and Export’ option.
The Import/Export wizard will appear on the screen, select ‘Import from another program of file’ option, and click ‘Next.’
Choose the ‘Personal folder file (.pst)’ option and click ‘Next.’
Here, enter the location of the PST file that you copied earlier, or select the PST file manually if you have stored it at a specific location, and then click ‘Next.’
After selecting the specific PST file, click Finish. The removed Outlook account will be restored immediately. But, make sure you restart your computer before accessing your Outlook account.

For more details you may visit:
https://www.nucleustechnologies.com/how-to/restore-a-removed-outlook-account.html

and here
https://www.lifewire.com/restore-outlook-pst-file-contacts-data-1173718