God's will and purpose for your life can be summed up in one word - grace. The grace on your life encapsulates God's will and purpose for your life. Therefore you can determine God's will and purpose for your life if you can determine the grace on your life. God also planned for each one of us to operate from an ordained location or locations on planet earth. That is where you will find success in what you do on earth. If you find yourself anywhere else, you will not achieve your full potential.
When you discover your grace, it will help lead you to your ordained location. It is in your ordained location that you will find the tools and provision required to succeed in what you've been destined by God to pursue and establish. If you fail to determine this, you will struggle because you may be compelled to engage in what you were not designed and purposed by God to engage in.
Your ordained location is central to your life commission. Your life commission is what you were "deployed" on earth by God to accomplish. Therefore the search for the grace on your life amounts to a search for your life commission. Your life commission is the real purpose you are on earth for.