One minor thing to add. Aviate, Navigate, Communicate.
In a PFL or for-real FL, maintain control of the aircraft, trim for approximately the best glide. Then look for a field and set up your approach to the field. And only if the field and the approach looks good and you have spare mental capacity, make a mayday call.
At this stage there's nothing ATC can do for you, other than alerting the rescue authorities. Which you hopefully don't need all that much if you did the Aviate and Navigate part right. But if you screw up the Aviate and Navigate bits, because you were too busy communicating, then the fast arrival of the rescue services on the scene are probably not going to make a difference.