Merion greens are a JOKE.
Good luck on #5. The only way to play it is to hit the ball in the hole on your second shot.
Like anything else, you have to practice to get better. Playing 965 Ranked Rounds in 7 1/2 years won't do it. That's less than 3 RR per week. How often do you play Merion?
I hated Merion for quite a while after I first played it. But I forced myself to try it again and again (the practice I mentioned above). I eventually got to where I developed a love/hate relationship with it. Loved the F9, haded the B9.
So I still forced myself to practice it. Your best score is a respectable 65. But it's a very demanding course that requires some course management. You have to plan your shots, and knowing your clubs is extremely important.
I saw you use the Max spin wedges, but you also are using the starter ball. It's hard to stop that ball where you want it on any course. Impossible to be close on #5.
We now have a practice putting green available. Use it on the hard setting and learn to putt at Merion, especially downhill.
Bottom line is you need to "Practice, Practice, Practice" to improve. If you are willing to work at it, you can get better. Or you can complain how impossible and unrealistic it is. Your choice.