You have to take the time to allow yourself to be aware of what's going on within yourself, and what's going on in the community around you. This "awareness" isn't the same as collecting data, or constructing thoughts that interpret things. It's not an easy thing to convey, since many people will take what I'm saying here and turn it into yet another recipe. And if I then say, it's more like mindfulness meditation, then all sorts of ideas and interpretation gets added to that, making it far away from I'm saying here.
I'm not very articulate about this. But maybe Carol Sanford's _Regenerative Life_ would better able to convey just how to find your unique contribution to that which is greater than yourself.
zen would say the harder you try the further away you'll be. You do have a purpose only as much as you don't. ..."sense" isn't the right word but it makes sense to me, it's more like just something you realize.
For me something like looking at life from a constant meditation on your future self [Alex Harmozi] or Gurdjieff's Self-Remembering or Vigyan Bhairav Tantra: Meditation Technique No. 33 allows this kind of consistent clarity.
With all of these examples. The trick seems to be in 'how'. Everyone can read this article, or a Buddhist text, or some Stoic essays, and agree and think it would be a good idea.
The 'how' to get there, seems to be the gap.
Everyone agrees having 'purpose' is great. The 'how to find a purpose' is the problem. Not just intellectually 'decide on a purpose', but 'believe in a purpose'.