And just as important, what are you intentionally not busy with?
"It's not enough to be busy. So are the ants. The question is: What are we busy about?" - Henry David Thoreau.
The people who rise to the top of their field tend to be "busy" doing the most important things. The more things they add to their list, the less likely they are to reach the top of their field.
For a successful athlete, "busy" may mean family, training, and recovery.
For a less successful athlete, "busy" may mean family, work, training, TV watching, social media, and weekend parties.
Maybe an equally good question is, "What are you intentionally not busy with?"
The question is rather easy to answer if you know exactly what you want, and almost impossible to answer if you don't. This question implies there is sacrifice and compromise to be made when we commit to a goal. Being really good at something may require us being quite bad at something else, and that's okay, so long as we're intentional about what we're bad at.
Start by being clear about exactly what you want, then get busy doing it.