PollyMC is a Prism Launcher fork but with “offline mode” and works perfectly on my opinion. I recommend downloading the flatpak version as the appimage asks you for certain versions of Java that are easy to install but sometimes gets a little complicated.
And yes, Micro$hit can eat shit. I personally bought Minecraft but on the day I was forced to migrate my Mojang account to a Micro$oft account with the threat that “If I don’t do it I’ll lose access to my game” I delete my Mojang account and use PollyMC since.