How do i become a more dangerous bowler?

Improve on your speed if you want pace. practice (if you dont know how to, you can always ask someone to help or look on the internet) how to bowl in-swing, out-swing, leg/off-cutters, reverse swing. That is if you want to become a good-dangerous bowler. BTW, Nathan Bracken and Irfan Pathan use some of these styles, there also very helpful.