You may encounter many defeats, but you must not be defeated. In fact, it may be necessary to encounter the defeated, so you can know who you are, what you can rise from, how you can still come out of it.
The thing is, continuity of strategic direction and continuous improvement in how you do things are absolutely consistent with each other. In fact, they're mutually reinforcing.
Believe in yourself! Have faith in your abilities! With a little self-assurance and a whole lot of confidence in your abilities, you're sure to achieve success and contentment.
Most decisions are like hats. Try one, and if you don't like it, try another. Mistakes are cheap, so try a few hats. Some decisions are like haircuts. You can fix a bad one, but it won't be quick and you might feel foolish. Don't be scared of a bad haircut.