PortProton is a mighty thing in my experience. Has both a game library and the ability to add apps to app menu in two clicks.

As the name implies, offers a wide offering of Proton versions (Steam, GE, CachyOS, GDK, EM, Sarek, version for HoYoPlay...), as well as Wine. Can detect popular games and choose perfect settings. Has one-click installs for some popular games and launchers. Available as Flatpak.

Downsides: the only languages available are English, Russian and Spanish, and advanced config can be more involved than with Lutris. In fairness though, you'll barely ever need it.