It’s totally fine to upgrade from Windows 10 to 11, it’s basically the same thing. Overall it’s better in some regards (like better HDR support, direct storage is coming and so on) and a bit worse in others (I do hate the new right click menu). No ads though and barely any difference to Windows 10 as far as I noticed in over a year of using it.
Windows 10 already had all that stuff, telemetry, a link to Candy Crush in the start menu, it’s the same shit. Windows 11 didn’t get worse in that regard at all.
So just do a fresh installation of Windows 11 (don’t upgrade Windows versions, it’s a mess in the background) and have fun.