Being an introvert is no excuse to not being able to product content.
Some of the biggest names in the online space are introverts as far as I’m aware based on what they’ve said or what I’ve read about them.
As an introvert, it may not be as easy to jump in front of a camera and just start talking.
But, there are a lot of other ways you can produce content without having to do that. Digital products, blogs, books etc. are all easy alternatives to getting in front of a camera or behind a microphone for a podcast.
The key is to just get started. As time goes on, you’ll become more comfortable with yourself and will probably find that you become more comfortable with the idea of getting on camera or behind a microphone.