How can this be "de-googled" but I can also use "all my favourite apps"? I'd love to step away from Google, but I have some requirements on apps from the play store for work (slack, okta) and personal communication (whatsapp).
WhatsApp actually provides an APK download on their website[0]. I'm not entirely sure whether they keep it as up-to-date as the version on the play store though.
/e/ provides its own Apps store, which have many apps including ones from F-Droid, but if you like you can also install something like Aurora and install any app. Not 100% work with MicroG but it is still great for privacy.