Which DE do you use? Sadly, on KDE Debian is quite bloated but there’s a trick, I deselected KDE when installing Debian.
Naturally, I booted into a blackscreen but after entering my credentials I ran the following command: sudo apt install kde-plasma-desktop
I rebooted into a beautiful and minimal Plasma desktop, it doesn’t even have a calculator but it still comes with a few questionable applications installed. From there I just set up flathub and I’m all flatpak.
I used this page, check the page for your favorite DE/WM: wiki.debian.org/KDE