Define my business goal

In the last 2 years,  I made only 10k and I’m determined to change this. How to define my goal: 10k/month ? 100k/year ? 500k/year ?
I need a goal that is realistic and ambitious and yet not intimidating.
Should I start with a goal of 10k and move to more gradually?
I am not clear about the process.
Then: how to focus, stop buffering and really achieve my goal?