20lpa is average amount in my line of work. If one got experienced and contacts then he-she can earn more than 20 lakh pa. If none of them then one can't even earn 5 lakh. Have experienced both scenarios.
I am full time freelancer and work as a 3d character artist - modeler for 3d games and miniature industry.
One piece of advice stay away from desi clients if one wants respect, work satisfaction and handsome pay.
How ironic! I am from the same industry and a freelancer as well. Yet I made close to 10lpa at my peak years.
You must really have strong connections .. and a really beast of a render machine.
Returning to the topic at hand. OP should only pay taxes on the invoiced FIAT equivalent of the crypto amount at the time of its creation. Since btc or any crypto is not regulated and not even a legal payment mode yet, you can't pay tax on "capital gains" and neither is it a good or service -unless you are selling the crypto as a broker, in that case, you'd be paying a forex tax - which is treated as just regular business income in India.