Read a book for each of the 9 enneagram types! https://www.enneagraminstitute.com/type-descriptions

Find out your type: https://www.truity.com/test/enneagram-personality-test

Booktubers with enneagram-based recommendations:
https://www.youtube.com/watch?v=cJ9MTlJz82I
https://www.youtube.com/watch?v=0TYD5SJMtpA&t=0s
https://www.youtube.com/watch?v=laTOgjnG_Zs