I'm unable to download iOS 11 Simulators for XCode 13.2.1 what should I do?
You can check supported simulators for specific Xcode version on Apple Xcode support page.
Additionally, as answered on a similar issue, simulator availability depends on the installed MacOS version. While Xcode 13.2.1 seems to support iOS 11 simulators on Big Sur, on Monterey the lowest available version is 12.4.