India has a very large community of cryptocurrencies and it looks like the OP doesn't need to ask anymore how to buy Ethereum.
I saw information on Binance that India has a well-known exchange, namely WazirX, looking at the history of this WazirX is really amazing, very good because the price is low and then it goes up hundreds of percent.
I mean, feel free to buy Ethereum on the WazirX Exchange and trade there with ease.