True Left

The only serious solution is mass emigration. The most obvious choices of destination for Indians are probably Britain, Canada, Australia, etc., but other good destinations are Netherlands, Denmark, France, Austria, Portugal and Sweden:

https://en.wikipedia.org/wiki/Colonial_India

Dutch India   1605–1825
Danish India   1620–1869
French India   1668–1954
Austrian India   1778–1785
Portuguese India
(1505–1961)
...
British India
(1612–1947)
...
Swedish East India Company   1731–1813

Even if ~100 million Indians emigrated to each of the above listed destinations, the remaining population would be ~1.4 billion - ~900 million = ~500 million, which is still several times higher than the pre-colonial population:



but it would be a start.