Now, Investing bitcoin is the way of buying and holding it for long term that is very simple way to increase your profit. Beside that investing to altcoin ICO projects or trading altocoins are also a good strategy to get more earnings but it's not very easy to choose a good altcoin for trading.
And usually the alt coins turn into scams at the ICO and before they even launch the coin in trading. Another thing is that alt coins just trade pretty well at the start and dies in just a short time. Trading alts is really a gamble, like investing in hyips. There is a great chance that investors will lose money if they don't invest in it at the start.