I feel that my mobile has been captured by the forces of evil (corporations). Unfortunately there are no viable Linux alternatives. I have decided to replace the apps with FOSS. There are not many alternatives, but the ones that exist are very good. I plan to buy a Google Pixel and install a pure Android (ironically FOSS).
My set list:
-Mail: K9 Mail.
-AntennaPod: Podcasts.
-PixelDroid: Pixelfed (Instagram alike app)
-QKSMS+: SMSs
-Transistor: Radio.
-Fossify File Manager: File Manager.
-Fossify Gallery: Photo Gallery.
-Fossify Notes: Notes!
-PassAndroid: Passbooks.
-Photo Editor.
-Feeder: RSS feeder.
-Tusky: Mastodon.
-Organic Maps: Maps!
-WhatTodo.
-Element: Chat.
-Screenshot sharer: Long press the home button to share your screenshots.