If there's no obvious volume control on the front of the chime box it doesn't mean the chime can't be set louder. Sometimes the chime is covered by a decorative cover and the controls for tunes and volume can be found behind the cover. Sometimes the controls are at the back of the chime. Some chimes can't be made louder but they tend to be wireless ones, which are easy to move closer. Say, out of the hallway and into the kitchen.
Take a look at the cover of the chime and see if you can see clips which hold it to the chime itself. If you see clips, depress them and pull the cover off. If not, try sliding the chime up or to the left or right. It is possible the chime is simply hooked onto screws which are exposed about ¼-inch from the wall.
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Turn off the power to the circuit which operates the door bell transformer. If you are unsure, switch the whole house off at the circuit breakers.
Remove the cover or remove the chime from the wall by following step 1. Be careful not to yank it too much so as to dislodge wiring.
Examine the case and try to identify a volume control. It may be on the back. If you see a volume control, turn the wheel or knob to a setting just short of maximum. Maximum may distort, sometimes called "clip."
Remove the cover of the chime. Be careful not to dislodge any wire terminals. Identify the volume control, if there is one. It may be as small as a screw head marked "Vol" or "Volume," or it may be very obvious.
Adjust the volume. Reattach any covers or re-attach the chime to the wall.
Turn the power back on and test. Repeat to fine-tune the sound level.