Looks like solved - you are a L20 Amateur with a 83 average now, after playing a few ranked rounds today.
Congrats!!
Did you change to the PC game by any chance?
Before looking at your profile, I wrote:
Play from FB is a niche which is even more unknown in these (PC-oriented) fora than mobile play with Android or IOS apps.
Therefore, I have no direct information.
The average (and subsequently the tier) is mostly influenced by the scores of ranked (strokeplay) rounds of 9 and 18 holes including WGT tournaments. Do you play these?
As a guess from the mobile game, you might be promoted at a certain level (?20?), regardless of the average.