A number of options here; I think we all, with @Nived_Nambiar and @MichaelAnnis think in the same direction.
Two options as an example:
If this flow is to be executed manually via a console on the user's desktop, you can get the UPN of the logged-in user with this cmd command. This will give you an email address if your AD is using that field in AD user objects. Otherwise, it will throw an error, and you will need to know where you store the email address and then query using PowerShell, for example.
whoami /upn
Suppose this flow is meant to be executed via Power Automate flow triggered manually by the user. You can get the user's email address who triggered the flow and pass it to PAD via the input variable.
In both cases there would not be the need to alter the flow for different users.
