Debian does allow support and contribution on many fronts and if you feel you are ready to provide some sort of input, there are many ways in which you can help Debian. More here
If you are a geek or even a start-up in Linux system, testing the operating system is one of the best support that you can provide to any distro. Reporting bugs is extremely important for the development of any operating system.
If you are developer, you will be very much needed for future development of Debian. The new release might have some areas where you can work on.