React Native project doesn't run on ios without any messages

Question

I developed my app for Android on Windows, and to test it for IOS, I set up my development environment on macOS. I installed everything without any problems. But when I run npx react-native run-ios, the process freezes on Building the app.... There are no error messages.

(The ^c comes from me when I stopped the process. If I wouldn't it just loads of in to infinity)

How can I debug this? Or does anyone have an idea what the problem might be?

I already checked out all questions related to similar problems on StackOverflow but couldn't find anything to fix this problem. Dependencies:

"dependencies": {
        "@babel/preset-env": "^7.15.8",
        "@react-native-community/async-storage": "^1.12.1",
        "@react-native-community/datetimepicker": "^3.5.2",
        "@react-native-community/masked-view": "0.1.10",
        "@react-native-firebase/app": "^13.0.1",
        "@react-native-firebase/auth": "^13.0.1",
        "@react-native-firebase/firestore": "^13.0.1",
        "date-fns": "^2.25.0",
        "firebase": "^8.10.0",
        "react": "16.13.1",
        "react-dom": "16.13.1",
        "react-native": "^0.64.0",
        "react-native-gesture-handler": "~1.10.2",
        "react-native-linear-gradient": "^2.5.6",
        "react-native-purchases": "^4.4.1",
        "react-native-reanimated": "^1.13.1",
        "react-native-safe-area-context": "^3.2.0",
        "react-native-screens": "^3.8.0",
        "react-native-svg": "12.1.1",
        "react-native-unimodules": "0.14.10",
        "react-native-vector-icons": "^8.1.0",
        "react-native-web": "~0.13.12",
        "react-navigation": "^4.4.4",
        "react-navigation-drawer": "^2.7.1",
        "react-navigation-stack": "^2.10.4",
        "uuid": "^3.4.0",
        "victory-native": "^35.5.5"
      },

Podfile:

require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'

platform :ios, '11.0'

target 'theta' do
  config = use_native_modules!

  use_react_native!(
    :path => config[:reactNativePath],
    # to enable hermes on iOS, change `false` to `true` and then install pods
    :hermes_enabled => false
  )

  target 'thetaTests' do
    inherit! :complete
    # Pods for testing
  end

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable the next line.
  use_flipper!()

  post_install do |installer|
    react_native_post_install(installer)
    __apply_Xcode_12_5_M1_post_install_workaround(installer)
  end
end