Your distro preferences don’t line up with your DE preferences at all. While you CAN install any DE on any distro, doing so often negates the point of using said distro in the first place.
Some KDE suggestions would be KDE Neon and Kubuntu, neither if which I’ve ever used, or openSUSE which I highly recommended.
So many chat apps that no one will realistically use. Until we have interoperability between different apps it’s completely pointless releasing new ones.