There’s a dangerous mentality that if you just put in the work and sacrifice enough then you will be successful. That’s absolutely necessary, but almost never sufficient.
If the willing to do the hard work and sacrifice is the “brawn,” then you also need “brains.” You have to be VERY smart about the moves make, why you make them, and how it sets you up for future success.
Brawn is not enough — you have to be really smart and make the right decisions along the way.