Avoiding Crash Out During Sustained Busy Period(s)

I will get ahead of this: I understand that this job requires significant hours and I understand that many people have and are working as many or more hours. I am not oblivious to these facts nor to the privilege it is to make this much money when others work the same (or more) hours for far less.

Over the last few months, I hit 220+, 270+, and am presently on pace for another 240+. Those hours have taken a toll that continues to mount as time for socializing, sleeping, exercising, or otherwise existing outside of work slips away. This has also led to a clear decline in my ability to focus and a struggle to consistently push out high quality work product.

For those who have been through this before, how do you keep pushing without genuinely crashing out?

Author: Agreeable_Sir3023