I remember when I was at the end of my marriage (little knowing that hellish years of trying to divorce would follow), a therapist asked me what my purpose in life was.
I said it was looking after my children.
She said that is not a purpose.
Obviously I also worked FT but I had a toddler and an older child and had just left an abusive and controlling relationship. The most important thing was being able to look after my children one of whom was subsequently diagnosed with SN. So I felt her comment was quite dismissive.
Five years - and a different therapist - later, I have some things in my life, aside from the children, which are important to me. I have goals related to those things so that I could answer my purpose is not only to stay alive long enough for my DC to grow up (as much as that is in my hands, of course) but also to do x and to do y.
I did a lot of meditation to de-clutter my head. One particularly good one by someone called Kelly McGonigal called Open Hearted Acceptance is about what you want to see in your life and what you have to let go of to be able to see it - or something.
In other words, what I am saying is that your focus might take a while to become clear and the work you have to do first is sort the jumble sale tables, so to speak. Writing everything down is a good way of doing this, I also found meditation useful (but it can be traumatic so stop if it brings up things you need to talk through with a professional).