Makes good sense to avoid answering the question, doesn't it?
I can't answer the question because I don't really know. I don't play NTRP leagues and, frankly, I think that system is a bit of a failure. When you look at the description of what, for example, a 5.0 level player is supposed to be, and then you see the players who are actually playing 5.0, and even 4.5, it's not reconcilable, IMO.
PS: Having said that, my serve is my biggest weapon (when my shoulder is healthy), and I exploit it for all it's worth. I have spent many 100's of hours practicing my toss and set up for the purpose of disquise and surprise, which comes in all the more handy as I get older and the pop on my serve isn't what it used to be. And, I recommend my approach to anyone. For some players, serving is a point starter. For others, it's the foundation of their game.
When I played men's open, 30+ years ago, in one match I was able to hold serve 3 times against a top 400 ATP ranked player. He beat me 6-2, 6-1. Since then, given the new technology and the complete metamorphoses of my game, my groundstrokes are probably better now than they were then, although my movement is nowhere near where it was then. So, what does that say about my NTRP level now? Who knows, who cares.