Where thought prevails power may be found! This is an excerpt from a Napoleon Hill book The Laws of Success in 16 lessons and was written in 1928.  This is just as important today as you work towards your definition of success.
“Henry Ford has made millions of dollars and is still making millions of dollars each year because he believed in Henry Ford and transformed that belief into a definite purpose and backed that purpose with a definite plan. The other machinists who worked along with Ford, during the early days of his career, visioned nothing but a weekly pay envelope and that was all they ever got. They demanded nothing out of the ordinary of themselves. If you want to get more be sure to demand more of yourself. Notice that this demand is to be made on yourself!
There comes to mind a well known poem whose author expressed a great psychological truth:
If you think you are beaten, you are;
If you think you dare not, you don’t;
If you like to win, but you think you can’t,
It is almost certain you won’t.
If you think you’ll lose you’ve lost,
For out of the world we find
Success begins with a fellow’s will –
It’s all in the state of mind.
If you think you are outclassed, you are –
You’ve got to think high to rise.
You’ve got to be sure of yourself before
You can ever win a prize.
Life’s battles don’t always go
To the stronger or faster man;
But soon or late the man who wins
Is the man who thinks he can.
It can do no harm if you commit this poem to memory and use it as a part of your working equipment in the development of Self-confidence.  Napoleon Hill-The Law of Success in 16 Lessons
Your mindset as a solopreneur is the most important area to address where your success is concerned.
You can do more, be more and have more, if you believe you can.  Think Big!!!