Fast read, well written.
You need know when to hold em and know when to fold em!

Are you in a dip, cul-de-sac, or a cliff?
Most of us quit to soon but then again we should quit often.
Knowing when to quit is the trick.

The goal is to be #1 in the world at something. It can be a very small niche, but you have to be the best in the world. Otherwise quit.

I heard this advice a few years ago when I thought was on that path, then I didn't following at suffered the cul-de-sac.