There's a few psychotherapy podcasts with episodes on narcissism. It's rare for malignant narcissists themselves to seek out therapy to help themselves so most resources are organized with how to deal with the narcissists in your life. But you should read them because if you can empathize with the other side and reflect on yourself, that would bring down your narcissistic tendencies. In general you should practice empathy, perspective taking and develop genuine curiosity in other people.

A true narcissist is by definition someone who wouldn't care or think anything is wrong or want to change, so you may have strong narcissist traits that you can work at reducing them.

Narcissists are people who are addicted to or are dependent on feeling special. See https://www.youtube.com/watch?v=YqV_QIvDeqA

Also the book, "Rethinking Narcissism" is probably worth reading.