I think the nice thing about 'purpose' is you get to pick it, to a greater or lesser extent.
I'm committed to being the kind of adult in the lives of the young people around me that their parents can't be (because they're busy doing the hard work of parenting).
I throw myself into my female friendships, to be an uplifting force in their lives and make our platonic relationships as beautiful and nourishing and important as romantic ones.
I focus on exploring the weirdnesses and depths of being a human being in the world – psychology, philosophy, nature... we only get one go at being a person, as far as I know, so I want to notice and soak up as much of the experience as I can, in as many different ways as possible.
I delight in being a part of a community, and try to nourish that community feeling in lots of ways (volunteering, chatting to everyone, connecting people who don't know one another), leaving a legacy of sorts in the memories of the people who live in my neighbourhood.
And on a bigger level, something that really matters to me is people's connection with nature. I wish we all had more of it in our lives, and that people were able to slow down and feel the benefits of being off-screen and 'in the green', so I'm currently starting to build a small business around that.
You'll get a battering on here for asking the question, OP, but I get it – and it's a great question for anyone to ask themselves at any time in life. Ignore the sh*tty comments.
If you start off by thinking about the things that feel most important to you in life, what does that spark for you?