It's tough since I can partially relate. The lack of purpose is indeed something I struggle with.
Retired at 51 continue to plan for the future with no purpose. I guess you could call it making lists of things I want to do and doing them. Finding long term purpose still alludes me. Start a family, become a multimillionaire, build a death house, I don't know.
I run around doing things but it's not really a purpose.
I have never had satisfaction from job or the praise of others. Achieving goals was my greatest purpose but I have basically completed them all.
It's like my life has no meaning and is hedonistic.