He is hypothyroid, ideal if first reading is borderline you should repeate the test after three months and if still hypo he will need treatment . Bhramari, udgit, anulom vilom pranayam as well as sinhli pranayam have some positive effect on such cases but results may vary, consulting directly will be adviced, D3 levels are very low , cheapest and richest source is sunlight exposure of skin for around 20 Minutes every day when sun has zenith angle with earth.

Uprise d3 capsule once a week for 12 weeks.

Yes, following a healthy Lifestyle is important. Avoid oil ghee butter cheese intake Junk food namkeen sweets etc

Avoid fried food and spicy food Water intake more Green leafy vegetables and fruits Do connect and consult