It is crucially important to understand your identity before you figure out what work you should do. This does not only apply to career direction, this applies to actions/decisions you make on a daily basis. Understanding your identity is important before doing anything because in the same way creation is an expression of who God is, work is an expression of who we are.
Once you truly understand who you are, who you are created by, what are you created for; then whatever work you are doing is does not become your identity, but an expression of who you are as an image-bearer, as a co-ruler of this world, as a child of God.
When your identity is security rooted in Christ, you achievements will not hold as much sway over your emotions because your identity is no longer in what you achieve. If I am keeping it real, yes - it feels really good to be the best in what you do and get the applause of people around you. However, when you understand that your work is an expression of who you are in Christ, there is a humbleness that comes along with your success - where you give the glory back to your Creator.
At the same token, when things are not going well and you fail, you might feel sad, disappointed, perhaps even angry. However the situation will not shake you or break you down, because you are not defined by your achievements but by who God says you are.
What matters in deciding what to do (work, life decisions, directional vision) is where/what God is calling you and being able to be sensitive to where the Spirit is leading. In deciphering where our calling is in each season of life, we focus on the CALLER (God) than the CALLING (work). What matters is not the result of getting things done, what matters is WHO is calling us because that is what give us purpose, perspective and the ammunition to push forward when things get hard. Our performance is no longer based on other people but we work for the audience of one. You work to serve. You work in a manner that reflects who God is.
This changes everything. This changes the way you choose your profession, the way you treat your co-workers the way you lead your team, the type of company culture you want to build. This changes your attitude towards every task given no matter how magnificent or small it is.
When you go to work tomorrow, remember that work (everything that your do) is an expression of who you are. How does your current view and attitude towards your work express who you are?