Activating standby DR after opening it in read-write mode

I have a primary and a standby database. Both two node RAC database.

As some testing had to be done in standby database, I had to open it in read-write mode.

I cancelled the recovery in standby and activated standby database and opened the two node database in read-write mode.

Now, the DR is broken. And to make the standby as a proper physical standby, full reconfiguration of DR is required?

If not, help me out in setting up my standby back in track!