@n8 @kerosene you should try your best all the time, but always realize that your plan always has the potential to swap around and your goals can always shift. Life doesn't stop and start within your 20s or whatever, it starts when you are born and ends when you die.
In 70+ years, my grandpa went from being an architect, to an acoustician, to a astrophysicist, to an astronomer, and towards the end of his life he learned graphic design and made and sold star charts.
Don't be idle, but go with the flow. Everything can change in a matter of years.