I think making a 5% profit by trading Ethereum is a viable option. You can observe the exchange rate of Ethereum, on average if the cryptos rate increases, it always increases over 6%, there are times increased to nearly 40%. However, you need to analyze the market carefully to be able to sell ETH as soon as the market dump on the exchange rate. But maintaining a 5% profit every day I think is not feasible because the exchange rate of ETH is unstable.