debian app on UserLAnd: upgrading to bullseye

[agyaanapan@yahoo.com]

i have installed debian (buster) on userland app (UserLAnd is an open-source app which allows you to run several Linux distributions like Ubuntu,
Debian, and Kali.)

i am keen to upgrade to bullseye.
my action:
* sudo apt-get update && apt-get full-upgrade
* sudo nano /etc/apt/sources.list: replace buster with bullseye
* sudo apt-get update && apt-get upgrade && apt-get dist-upgrade

am i missing on something. i have limited data plan. hence, requesting opinion or suggestions here.

regards,
agyaan