If you want to avoid the hassle that it takes to set up a Microsoft account you may try Minetest instead of Minecraft.
It's an free and Open Source reimplementation that needs no Java, and the game mode "Mineclone" is very close to the original.

Regardings RTS I can recommend Supreme Commander: Forged Alliance

I you want to try out a business simulation you may look at OpenTTD which is free (and free of ads) over Steam.

And don't forget Among Us.