There are AOSP based roms that are de-googled. You can use third party app stores to download foss software, or other 3rd party stores that let you download from Google play (aurora). iPhone is basically the only other choice, but it's not any better in this context.
Lots of alternative email providers. Protonmail is one.
For maps, openstreetmap exists. You can also use Google maps without an account inside a secure browser. That will minimize data collection.
You can use a downloader (yt-dlp or a gui that wraps it) for YouTube, or use a 3rd party app like NewPipe. Again, using YouTube without an account in a secure browser is an option.
Chrome can obviously be replaced with Firefox/LibreWolf. If you must have a chromium based browser, you can use ungoogled chromium. chrlauncher is a small app that can be used to make it easy on windows and keep it updated.
You cant really do anything about the apps that use chromium internally for rendering, besides finding replacements.