Increase the device volume
Increase the app volume
Turn off silent mode
Disable Do Not Disturb
Clean the speaker grille
Remove any phone case covering the speaker
Move the speaker away from soft surfaces
Place the speaker in a corner for more bass and loudness
Use an external amplifier
Connect to a louder Bluetooth speaker
Enable volume normalization or loudness settings
Turn off audio equalizer settings that reduce volume
Update the device software
Restart the device
Check for speaker damage
Replace the speaker if faulty