I'm not keeping track of the number of games I play
next time you tier up, look at how many ranked games you have played.
right now you have 101, you would have needed 60 before getting to Master.
Don't avoid bad rounds, you need those to make up your games.
If you avoid them it is harder to lower your average once it does level out.
(this is where quitters stuff themselves up)
Kiawah Back 9 and St Andrews Front 9 are the easiest to do well on, but getting - 4 on one of those wont reduce your average as much as the same score on say Oakmont, St Georges or Olympic.
Bethpage is also a course which wont reduce your average much when you do well on it. Bethpage F9, is the easiest to putt on.
Also, beating a higher tier in a Matchplay round will reduce your average by a larger margin again.