You're talking about Tour Master, and the threshold for that is a 63.00 average.
I rather see a 71 (and a 66) in your recent scores than a 61 - the 61 was a few weeks ago.
My two Pfennig: Practice...
Other hints:
It's easier to be promoted on 9 hole games (scores are doubled), and you might want to experience some of the course variety, other than STA day in, day out.