Just remember, trading is also an investment because you put your money into it to earn some profit out of it. Then its all the same but there are lots of investment which they differ some may gain profit for a long time or in a short time basis. You can choose freely on what investment would you like just be careful on choosing the right one.
I only trade bitcoin with good altcoins. So if I buy the Ethereum, for example, its price drops against bitcoin, but it still rises against dollar.
Me too, i also earn bitcoin by trading it altcoins. I trade litecoins and dogecoins which have really good future. I don't trade those coins showing nowadays which most of them (but not all) are definitely scams. The only plan of the developer of that coin is to get bitcoin from traders. They just pump few times amd dumps their coin and run away.