It is true that most of those who have tried to earn bitcoins through trading, have done so through the exchange of cryptocurrencies, however it seems increasingly difficult to obtain good profits in this business in a market as unique as the crypto one.
That is why I would recommend to all those who know the technical bases of trading to try a more stable and predictable market than the Crypto market, and that is the Forex market, where what is exchanged are fiat coins.
And fortunately there are Forex brokers that allow trading with denomination in bitcoin, making deposits and withdrawals in Bitcoin or even trading cryptocurrencies as CFD.
The important thing is to look for alternatives, and this is one of them.
You have just narrated what I am doing currently, earning Bitcoin through forex trading. No doubt forex is much stable and predictable market than crypto currency but its is very risky too because people take over margin trades and a little correction of the market leads to account loss. If you are a good trader you can earn much more Bitcoin in forex trading. Many brokers give opportunity to deposit funds through Bictoin and trade all currency pairs with BTC as base currency, there you get dual benefit. First you make profit through trading, second if value of Bitcoin increases, its an ice on the cake but vice - versa is also true.