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. 
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.
So staying in bitcoin to trade is enough i think but you should always monitor the price and set a margin with alarm so that you can't be late when selling your bitcoin if you madea profit.. but expect that don't sell it all only a percentge ofyour bitcoin because there is possibility that the price of bitcoin can be increase more so only percentage is enough just to get the profit if ever the price is dropping again..
Investing in altcoin yeah don't go in shitcoin much better to invest those who are in a good rankings in coinmarketcap but not guaranteed that you can gain a good profit to stay long with altcoin because there are altcoin that can be active today and next day it drop gradually until it became no value..
So think deeply first and bitcoin is enough to start a trading basic and earn massively..