Mantra below:
Om Srim Hrim Klim Glaum Gam Ganapataye Varavaradha Sarvajanam me Vashamaanaya Swaha
ॐ श्रीं ह्रीं क्लीं ग्लौं गं गणपतये वरवरद सर्वजनं मे वशमानय स्वहा
Best to chant the above mantra 1000 times a day.
One more best way to use this mantra is to sprinkle some water on Ganapati idol in the form of tarpanam.
That is chant above mantra and add the word "Tarpayami Namaha" at the end of mantra and sprinkle some water on the idol.
This can be done 444 times each day. If not possible do it at least 100 times daily. You can experience changes in 3 months of starting this sadhana.
For each Tarpayami Namaha sprinkle some water on the idol.
Before starting this process visualise the Lord Ganapati is entering the idol (meaning energy is entering into the idol).
Then after completion visualise that the energy is returning back into your body.
Then after completion visualise that the energy is returning back into your body.
Collect the water that is sprinkled and drink some of it and use the remaining for bathing purpose next day. You can also distribute this water to your family.
This mantra is very useful to remove problems, problems related to muladhara chakra, gives material prosperity and health and security.