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killyourfm Congrats! I've been running Google-free Lineage for a little over a year now, and find it incredibly refreshing. I host my own Nextcloud for calendar and contact sync, and it works as well (or better) than what "creepy uncle Google" has to offer. Using DAVx5 from fdroid makes it possible to attach remote calendars to the Lineage one. Oh, and AntennaPod is a fantastic podcast client!
There is an app (YALP store) that will snatch apps off the Google Play store - sometimes they work, sometimes they don't, and it is completely against Google's TOS. In a pinch, I use it to get a couple apps (Outlook for my university's email). Might work for your bank's app. Otherwise I recommend seeing if your bank supports SMS, too.