Mauni Amavasya:

Mauni means Maun. To keep quiet. I know its not possible for whole day, but at least take out 1 hour when you don't speak. Just sit quietly and let the thoughts flow in their own way.

What else to do?

1. Donate food on the name of your ancestors.
 
2. Light a diya in front of the picture of your ancestors. Those who don't have picture. They can light a diya in south direction in evening (Use til oil for diya).

3. Clean your house. sprinkle Gangajal and Gulabjal everywhere except toilets.

4. Light chandan incense sticks. Burn Kapoor in evening and rotate it on every corner of your house to remove negativity.

5. Feed cows, dogs and crows. Its good if you feed jaggery to cow.

6. It is believed that on Mauni Amavasya nectar falls on river Ganga. So taking dips in Ganga is highly auspicious, if it's not possible you can add Gangajal in your bathing water.

MOST IMPORTANT REMOVE ALL GRUDGES, JEALOUSY, EGO AND HATRED.GIVE YOURSELF SOMETIME BY SITTING QUITELY AND STAY PEACEFUL