What is the most feasible way to reduce anxiety and sadness?

By understanding the nature of the world that the world consists of pairs of opposites. Profit and loss, joy and sorrow, birth and death are a part and parcel of life. You just have to develop the strength to meet with both these opposites with fortitude and you will get there. So, with the study of the Gita and living the principles of the Gita, you will get there.