I have zero followers on Twitter . How do I change that?

Provide daily, meaningful content.
Be active - interact with people.
Stay consistent - it won't happen over night.

I work on my twitter profile now for 6 months - got almost 2600 Followers. It could be better, but I did not put the most effort into it.

If you lack ideas: look at some bigger accounts that fit your target group, get inspired by their posts and recycle them.

Create a swipe file (Google Sheets, Airtable.com, etc.) and store all your ideas and inspirations you come across. That will help you to create content for a long period.

Edit: make your nav a bit slimmer. It's huge at the moment, but there is no content in the second row.