Can you tell me if I can Trade in Cryptocurrency because I see good potential there? If not, then what can I do with already purchased coins? It’s basically new concept but way better than our conventional currency where banks and government is involved.

There is no legitimate problem in dealing with Bitcoin and similar digital currencies by buying and selling, as is the case with the rest of the currencies, goods and stocks.
The problem with digital currencies is that they do not have an external reality, but are a virtual commodity, and from this point of view, His Eminence Al-Sistani is reserved in dealing with them, and does not say that the transaction is forbidden.
And since he does not express an opinion about it, his imitators can refer to another jurist who issues a fatwa on the permissibility of dealing with it.