I would recommend using apkupdater for closed source apks, in particular enabling apkpure repo, rather than insisting on using google repo with aurora store or any other mechanism.
Also looking for FLOSS alternatives if possile (granted things like whatsapp and waze won’t have alternatives for example).
Some metioned apkmirror as the more trusted repo for closed source apps, however it’s currently formatting apks on multiple apks, and supposedly requesting for the apkmirror own instaler, so I recommend apkpure instead, which is also pretty well regarded, and they also in theory offer the same packages as the ones on google play…
For FLOSS apps, the different f-droid repos (official ones and non official ones such as izzy-on-droid) offer a good amount of them.