I’ve read Man’s search for meaning by Frankle although it was moving, his personal motivation / source of meaning (religion) doesn’t work for those who aren’t religious.
"We can discover the meaning of life in three different ways: (1) by creating a work or doing a deed; (2) by experiencing something or encountering someone; and (3) by the attitude we take toward unavoidable suffering."
This is the key takeaway from that book for me, no religion needed.