There are tools and techniques that can be used to help with long-term planning and unforeseen changes, as well as to analyze where you currently are. For the long-term, using scenario planning is my preferred method for determining the impact and predictability of an uncertain future.
My guide for a plan of assessment is to perform a risk assessment with a STEEP model. There should also be a section for goals not yet met, current challenges, and any setbacks that have occurred since the last assessment. Finally, it should contain ideas for how to address the setbacks in positive, growth-oriented ways.