Okay so this post is wrong is many ways. I'll try to explain.

What is the caste system?

The caste system was actually hierarchical division of labor within the Indian society.
It stopped being just a labor division during the time of the Mughal and the British.

Can a person change his caste?

In the ancient times, yes. There have been many cases where people have gone from lower caste to a higher caste the most famous examples of this case are:
Maharishi Valmiki: he started his life out as a Highway robber and became a great sage. He's the author of the Ramayana.
Veda Vyasa: He was born to a fisherwomen and he is the author of the Mahabharata.
Many Indian Kings and conquers have also been born into a lower caste but that didn't stop them from not achieving great things.

Caste system in modern India

There's no caste based discrimination in India except in a few rural and undeveloped parts of the country. People from the lower caste are given equal opportunities and there's also affirmative action that the government has undertaken to help them.
Even the Indian Prime Minister belongs to a lower caste, That didn't stop him from achieving great success in politics.

Now here's the truth, most of what you hear about India in the west is from self-hating Indians/Leftists who are now part of academia.
The crypto currency ban has nothing to do with caste or religion. Thanks government is doing a crack down on money laundering and the crypto ban is just a part of that.
PS. They didn't ban crypto here, The ban was suggested in a draft.