You don't need to get 8 or 9 birdies every game, after a certain number of games the system ignores your worst scores. It's different for each tier, I think 40 for master. After this if your worst score of of those 40 is, for example, a 74 and you shoot a 68, the 68 is counted towards your average and the 74 is dropped.
You will eventually shoot enough low score rounds to get to the next tier, it just takes ages. And don't expect shooting 2 under your average to make your average drop by 2, your average is made up of your 40 (as master anyway) best scores divided by 40 so you have to score very low to make a big difference.
You'll get there, don't give up. And when you do it all starts again from scratch.