I do reassess my purpose every few months when I create new goals. To ensure that my purpose aligns with values and direction I want to go.
Yes, every now and then I engage the services of a coach to help me think through my purpose and how it applies to my life at that time. Once I settle on a purpose for that era of my life, then I have different ways of reminding myself about it. One of my favorite ways is to put it on a sticky note on my computer screen. I see it all the time, and it’s impossible not to remember it. I also share it with people in my family and my friends who support me.