I will expand on your list.

Search - Qwant or Ecosia

Contacts - Simple Contacts

Calendar - Proton Calendar

Maps - Organic Maps

Docs & Sheets - CryptPad

YouTube - Odysee

YouTube Music - Apple Music, Bandcamp

Photos - Simple Gallery

Google Play Store - APK Mirror, Obtainium, F-Droid

Weather - Geometric Weather

Google Authenticator - Aegis

Google Messages - Simple SMS, Signal, Telegram

GBoard - Floris Board, OpenBoard