Debian 11 missing packages I need what configure should I run?

[Barry Scott]

I have installed debian 11 (bullseye) but find that its missing packages 
that I need for my software.

For example python3-pyqt6 is a must have. debian 11 only has pyqt5.
What do you recommend I do to be on a debian which has the newer packages?

What is the stability expectation of your recommendation?

Barry