To make dist upgrade from Sparky 6 to 7 do:

1. Backup your personal files to external disk or partition.

2. Change Debian repositories from bullseye to bookworm at the file:

 /etc/apt/sources.list

So it should look like that:

 deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
 deb-src http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware
 deb http://security.debian.org/debian-security/ bookworm-security/updates main contrib non-free non-free-firmware
 deb-src http://security.debian.org/debian-security/ bookworm-security/updates main contrib non-free non-free-firmware
 deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
 deb-src http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
 deb http://deb-multimedia.org/ bookworm main non-free

3. Change Sparky repositories from potolo to orion at the file:

 /etc/apt/sources.list.d/sparky.list

So it should look like that:

 deb [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ core main
 deb-src [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ core main
 deb [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ orion main
 deb-src [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ orion main

4. Refresh package list:

 sudo apt update

5. Dist upgrade now:

 sudo apt full-upgrade

If any problem run:

 sudo dpkg-reconfigure -a
 sudo apt install -f