Self-indulgence is an aspect of self-centeredness.
I find including others more is a difficult process. The plan is to first make space for them then figure out how to use the space.
It is hard to ask people about themselves when I am biting my tongue to stop talking about myself.
Maybe I am spending too much time biting my tongue. Maybe I should spend more time getting interested in other people. And maybe I could start by confirming if I am as good at cold-reading as I think I am.