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.
Next Steps
You can start oral vit d3 suppliment
Health Tips
follow up investigation is advisable