3 things in your mentality to be successful.
Simple but hard to do
1/ Believe in yourself.
To this, you have to know your value. To know your value, you have to keep getting reps. To keep getting reps, you have to keep putting yourself out there.
2/ Double down on that belief.
Your primary functions as a Founder are to 1) maintain the vision, 2) get talent on your team, and 3) keep cash flow by any means necessary. You have to have the courage of your convictions to do all 3.
3/ Exemplify excellence in all endeavors.
Do what gives you energy because you need to be excellent in all you do even when it sucks.