Conversation so far:
What was Rabindranath Tagore doing in 1901?
In 1901 Rabindranath Tagore moved to Santiniketan.
What did Rabindranath Tagore do in Santiniketan?
Rabindranath Tagore founded an ashram with a marble-floored prayer hall—The Mandir—an experimental school, groves of trees, gardens, a library.
What did Rabindranath Tagore do after being in Santiniketan?
Rabindranath Tagore gained Bengali and foreign readers alike; he published Naivedya (1901) and Kheya (1906) and translated poems into free verse.
Did Rabindranath Tagore write books?
Rabindranath Tagore published Naivedya (1901) and Kheya (1906).
Were Rabindranath Tagore's Naivedya (1901) and Kheya (1906) books popular?
Rabindranath Tagore gained a large following among Bengali readers. He published Naivedya (1901) and Kheya (1906). Non-Bangla translations were also published, but these were frequently of mediocre quality.
What else was Rabindranath Tagore doing in this time period of 1901 - 1932 besides moving to Santiniketan, founding an ashram, and publishing Naivedya and Kheya along with mediocre translations?
In November 1913, Rabindranath Tagore won that year's Nobel Prize in Literature: the Swedish Academy appreciated the accessible nature of  his translated material focused on the 1912 Gitanjali: Song Offerings.

Question: What was he doing in the 1920s
Self-contained rewrite: What was Rabindranath Tagore doing in the 1920s?