waiting for the price to go up and make sales in my opinion it is an investment to take profit as much as possible, I often monitor bitcoin price movement, when the price down you can make a purchase and when the price of start to rise you can make a sale before the price correction.
You must invest and wait for the right time to sell your bitcoin if you want to earn much income. Investing on bitcoin is nice idea because it is a good investment for long term and it will help to earn more income. Lastly, if you invest now there is a chance that you could become rich in the future.