For now the best thing to make a profit in crypto is just trading. Trading gives us several options that we can do or depending on our taste. Not just Bitcoin and Ethereum, but there are some other good coins for us to choose from namely Binance Coin, Polkadot, and other top coins.
Whatever the investment instrument, there will always be small or large risks. Likewise with trading.
Everything is determined by how expert you are in that field.
And to become a professional trader, patience and discipline are two very important things that are needed.