There are many ways to trade your bitcoins. For you what is the best?
Well, I guess the better and good way I think is use our bitcoin in the exchange platform to buy some other altcoins which is a legit one then its up for the traders if they're gonna trade it for a short or long terms to get profit in the long run.

I am sorry in advance but I dont think so its sagacious to buy altcoins for bitcoins. Its good to do trading at famous exchanges with bitcoins but buying altcoins or any other coin is not a good move. Personally I feel that bitcoins are an epic asset. One should keep them for as much time as possible. When prices are high, and then convert them to fiat.
Yes you can hold your bitcoins and convert it to fiat if your desired value is met. But if you use bitcoin in trading, of course we assume trading it with altcoins, then all I can advised is trade with the top cryptocurrency or with higher market capitalization. Do not trade with shitcoins unless you know how to play with it. I mean you know when to enter and exit since it is very risky.