One of the simplest ways to isolate different applications and personal data on an Android device is to use multiple users. This is a feature which has been widely available on #Android phones since 2014, but goes fairly underutilized by most people.
https://discuss.privacyguides.net/t/common-user-profile-setups-for-android/27364

Common User Profile Setups for Android
One of the simplest ways to isolate different applications and personal data on an Android device is to use multiple users. This is a feature which has been widely available on Android phones since 2014, but goes fairly underutilized by most people. Originally, this feature was intended to support multiple physical people sharing the same device, with the AOSP team envisioning a second user being added to a tablet for children to use, or critical response teams sharing a phone for on-call dut...