Get the sun in your eyes every day and on your skin. Think about what activites you can do outside that you were doing inside and bring them out under the light of the sun. If it is cold out, that is okay.
Thank you Doctor Inna Kogan for putting up another brick in the wall of scientific research illustrating the benefits of the sun.
BODY LIFESTYLE 101 - Move as many indoor activites outside as you can.

https://www.ncbi.nlm.nih.gov/pubmed/22213311?fbclid=IwAR0e5ctZCdUh5WyetQqNJkktDXiHNqK_IpfLcKtrUhZfrsfyo_rXemgjnZc