[oh_sigh]

The problem might be - it sounds like you're using your twitter account for marketing, not interacting with people. Personal twitter accounts can actually be good places to do self marketing, but you need to put in the work to actually grow your network first, because you don't generally grow it from marketing itself.

Basically, first you need to follow a bunch of people that interest you, and interact with them in some manner. Do this enough and you will get followers back, and people will start interacting with you, and that will draw more people in, etc.