[Galaxy S21] Customize Volume & Vibration for Specific Notifications

Would you mind marking my post as your solution?

What does it say in the section "when routine ends"?  If it does not have the routine end section, you can add an action to wait a period of time, say 30 seconds, if you just need it loud long enough to hear the notification, and then return the volume to the level you usually keep it.  In my example, adjust all the volume levels to where you normally keep them, them turn up the notification volume, then adjust it back to the same level. if you have another app for which you need this feature or want to hear a notification or a phone ring from a specific caller, you can just add those parameters to the same routine instead of having separate routines for each app/caller.

Yeah, it's really odd, some routines have a "when routine ends" section that puts everything back to the settings it was at before the routine ran and some don't.  I think it depends on which actions are used in both the trigger and actions.  My home unlock routine has an end routine, whereby my phone goes back to whatever state of locked it was in before the routine ran (connected to my home wi-fi).  If I have my watch connected, it remains unlocked, if my watch is not connected, it locks.