Maybe I am similar, I am very reluctant to promote my work, I don't want too much attention.
I actually briefly worked a job doing social media marketing where it was my job to create attention grabbing content. I had some moderate success there, but the more I succeeded the more I was overwhelmed, I really did not enjoy having to deal with so many messages every day and gave up the work very quickly. Part of me liked the attention, but a bigger part didn't want it.
tl;dr: I am an introvert, sounds like you are too, maybe some successful introverts can share their advice with us.