Viktor Frankl was an Austrian neurologist, psychiatrist and philosopher, founder of logotherapy and existential analysis. He survived from 1942 to 1945 in several Nazi concentration camps, including Auschwitz and Dachau.
Finding a "why" to live, it's about finding something that fulfills you and a place where you see yourself in many years. There's always something to achieve in your career or personally. Life is about climb up in every aspect you can. So you must have a dream to build up, in the short or long run. If you don't know what success looks like, how will you know when you have achieved it. If you don't have a clear goal, then you cannot put a clear plan in place to achieve it. Clear goals allow you to create clear plans, which increase your probability of success.
When you really believe in yourself and what you are building up, you will be driven by a kind of motivation to achieve what you set out to do, and to overcome any obstacles that come your way. To achieve big goals, you need to be firm on the goal, but flexible on the approach, and having a strong why will help you keep your eyes on the prize and keep going in the tough times.
You need to believe what gets measured gets done, but you need to believe even more in the power of motivation. When you know what the small interim goals are, as you start to achieve them, this will increase both beliefs in the approach and also confidence that success is achievable.
So the "hows" won't be a problem if you feel convinced of what you're looking for and where you want to arrive at this road, your great human wit will find the way.