I mean cloud mining is a scam but there must be something else we can actually do right?
I think there are many ways where to invest bitcoin to earn one of them is through trading, like buy a certain altcoin at its lowest price then sell it after making some profit. It is a must not to be greedy on this though as you know crypto is very volatile, it maybe high now then the price plummets later. So selling your coins at some profit margin is a must. Another one is through ICOs as you can buy some tokens with bonus and sell it later once it hit exchanger platforms or you can hodl on it if you think it really is a good project. Those are risky investments so if you are more on a conservative type, better put your bitcoins on a wallet and leave it there for the mean time. Wait for its price to moon before you withdraw.