Unfortunately, overhunting has severely reduced their numbers to the degree that Serbia is one of the few places where they are still plentiful thanks to their rigorous protections.

Damn auto-correct. Who doesn't include "Debian" and "Sid" in its default dictionary?

All you do is update your current system, change your repo sources to whatever branch you want, then do a full-upgrade. For branches there is stable, testing, and unstable (called sid). They don't recommend you use sid for everyday use, things can be buggy (currently sid is on GNOME 44 at any rate). Instructions

It's really common and actually explained in the Debian Wiki. Also, as others have mentioned, a stabler choice would be to use Debian testing/trixie, which will get GNOME 45 after a week or so in Debian sid/unstable.

Finally, the "one way ticket" is not really that. You can always wait for your testing or sid Debian OS to stabilize by managing your sources list in time. For example, by using "trixie" instead of "testing" in your sources lists, as long as they are all official repos, when Trixie launches as the Debian Stable distribution, you will be using Debian Stable. If you choose to use "testing" in your sources lists, you will always stay with a Debian Testing distribution.