@mike24 As a someone your height, just slightly lighter (like 225) I can see your frustrations. There are plenty of things we have in our favour, but unfortunately things that require the extremes of our range of motion (ground to over head, bottom to top of squat, etc) take longer than they do for the average heighten person, let alone elite crossfitters.
Let the reality sink in, accept your result, and if your life allows it, understand that this is not your last open, and you have huge potential compared to where you are.
And remember that the open is about testing, and not training. Keep showing up to training consistently for the 11 months of the year that there isn’t the open, and you will see the improvement you are longing for just now.
I’m on my 5th open this year and will be over the moon if I can rx all of the workouts, with the reality being that I should scale at least one of them. Progress takes time, and more of it if you are a little older than most.
Stick in, stay humble, and have fun. The day it stops being fun, this isn’t a hobby anymore and has become an idol.