I don't have the same phone use case as others and vice-versa, so I can't tell people what app is a "must-have", but the transition is easy if you set up sandboxed Google profiles (which aren't actually attached to a Google account, so the name alone can be confusing).

Basically you're creating walled-in setup for each type of profile, wherein the apps you set up in Profile A can't see what you have going on with Profile B, and the same goes for each app, you can even set storage scopes and limit what each app can see or do on your phone. For example, my nostr apps can't see my image gallery, only the ones I downloaded (and then I empty it after posting to nostr).

I have a profile for Banking and Maps, one for Uber, and one I keep important notes on. Then my main profile has my browser, games, and Primal/Amethyst.

I like using HereWeGo and Open Street Maps, and one tip I have for SwiftKey keyboard addicts is to disable network permissions so it's not connected to anything when you type.

Oh, and I know a LOT of people hate Pixel's design (so do I) I use LawnChair (home screen/app drawer launcher) lets me style everything in conjunction with Nova Launcher and hide things I don't use)