Hello @SHRADUL SAXENA ,
Can you try using robocopy command .
https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/robocopy
More significantly, that command has got an option /MT (Multi Threading) which will help out in copying the data of different folders in parallel.
Please try out.
You can also use multiple command windows to start the robocopy command for different folders
Regards,
Shiva.