Some ways are as follows:

1. Have at least one higher goal in your life which will act as an anchor for your mind.
2. Body stress can give rise to mental unrest. Eat according to your body type (Vata/Pitta/Kapha etc.). A very careful analysis may be required to understand your body type probably requiring professional ayurvedic consultation.
3. Nature made us to do some physical labour.  Make it a point to do some physical exercise daily.
4. Experience the sensation of breath above the upper lip every few minutes.
5. Be aware of your presence, body sensations and activities of the surroundings once in awhile.
6. Periodically mentally say “I Am” or “AUM” and abide in IAmness.
7. Periodically watch how thoughts pop-up on their own. Also watch body parts doing various activities. This is witness attitude.
8. Relax/Take a Nap/Slow Down. Listen to your body.
9. Listen to music.
10. Try a herb like Gotu Kola (Centella Asiatica) for certain minimum duration in consultation with an Ayurveda Doctor.
11. Take deep breath occasionally.
12. Increase the flow of blood in the brain by bending the head towards the floor after taking Sukhasana posture once/twice a day.
13. Accept yourself, i.e. don’t be over critical of yourself.
14. Try to develop the attitude of play in your activities.