This is not very detailed, but hopefully it will help people to protect their privacy completely.

1. Use UAD to debloat your phone, don't forget to download ADB and keep in the same folder as UAD and enable USB debugging in your Android phone, make backups of your important files before you use UAD and as extra advice, download a separate reliable launcher and keyboard, why? you ask, because most OEM keyboards and launchers contain spyware, so UAD may remove them and if no replacement was available when UAD does that then your phone will be trapped in boot mode, because there is no launcher. If any needed app got removed by USD, remember that you can restore it. And disconnect from any OEM accounts on your phone.
2. After you debloat your phone, make sure you disable Google Play Store( you can replace it with F-Droid, Huawei app gallery, UpToDown or ApkPure) and install Sunup from F-Droid to get notifications. After that you can disable Google Play Services( some apps need it, so you need to check if your apps does work without Google play services).
3. Use a DNS service that block Google: you can use Custom Next DNS or Adguard DNS(Require registration) with No-Google list from it's filter settings or if you want an account free option, you can use Decloudus DNS, but the free service suffer from down time frequently.