Let's give an example of you bought 100 BTC at 9000$ Price and the price went 9010$ in seconds then you sold, so your profit will be 1000$, may 500$ fees, but the another 500$ you made it profit in seconds!
Let's discuss at the point!
That is not something like that to play the market. Maybe you cant cover the fees when buying and selling Bitcoin on the exchange.
Remember that buying on exchange is different from selling price. It doesn't make sense at all if you are planning on this way of making a profit in Bitcoin. You will not quickly reach that. Invest in the long term and monitor the market price movement is the best way.