Welcome!
I suspect that an 80 average is needed to become a Pro and a 72 average to advance to Tour Pro. I'm at 72.1 and waiting...
Besides, you need a certain (low) no. of ranked rounds to advance.
Note that the average will start from scratch after s.o. changes to a new tier. Inside a tier (the pro tier) it's the average of the best 20 rounds.
Therefore, you cannot compare the averages of different tiers. There are Tour Pros with averages way higher than me - different conditions...
Edit:
9 hole scores are doubled before counting in the average.
mac: Look into your stats (best rounds) and you'll see what you have to work on.