A layman's definition for the term velocity might be "speed with direction." What is the velocity of your life? Which way are you going and how fast?
Consider a car. If it is going in the right direction, but only traveling at 1 mile an hour, it has a low velocity. If the same auto has a high speed, like 75 miles per hour, but going in the wrong direction, it will never reach the correct destination. Both factors are important.
For human goals, the velocity of success is probably better defined as "intensity with direction" as projects require many types of effort which may or may not be 'fast'. Goals require work. This is the Law of Action.
Have you determined your direction?
Have you maximized your intensity?