Pretty much what has been said above.
Good chops, good sight reading chops [although many get by without this - but will open other avenues]
good lugs, know plenty of tunes,Versatility.
discipline,great attitude,polite networking,and no hustling.
And a passport.
And contrary to what some think, you can run a family, go on holidays,
Eat and own a property [or two]
Garry