Try using LightFlow & let it handle the sound & vibrate Notification--> https://forums.androidcentral.com/e...geconsulting.android.lightflow&token=W3j5lW5J
For best results I disable sound & vibration in the individual Apps themselves then enable them in LightFlow.
There is a setting within the phone to increase the vibration intensity.
Settings > Sound > Vibration intensity
There is a setting within the phone to increase the vibration intensity.
Settings > Sound > Vibration intensity