In [1] finance, rate of return (ROR), also known as return on investment (ROI), rate of profit or sometimes just return, is the ratio of [2] money gained or lost (whether realized or unrealized) on an [3] investment relative to the amount of money invested

You have to measure your performance.

Brush up on your statistics knowledge.

ROI is a rate of “acceleration of profits” as well a metric for determining viability.