Perhaps you mean, you buy another Coin because you suffer losses when you only hold one crypto only. If you buy another Coin, then you make a profit by selling it again, and buy another Coin again. I think you are trading. So basically if you buy any Coin then sell it again and you get profit, I think that can be said as trading. But if you buy some kind of Coin, but you do not sell it. I think what you do can be said you invest.