Well you can divide it save some for future use. Although we have problems with the volatility of the coins but as time goes by certainly when usage goes up value will certainly go up moattet what. So its better to hold some.
I agree, you can put some of it in your wallet or saving account for future purposes. I think also it will depend on the coin that you are mining. When you see that the price was profitable enough then think for it to sell your coin because it may fall again if you didnt grab that opportunity.
It is like a 50 / 50 chance for we could have that much earnings. Dividing your earninngs versus dividing your savings is the best practice that we can do. We assure that, we invest what we afford to lose, and not all of our earnings will lose quickly. It is not that kind of hi lo games, which if you are lucky, you win the game, indeed we must know how to handle it