I do not think doing both of them at the same time will be a good decision because you can confuse the two type of trading and you will not become a master of anyone. If you want to become a short term trader, you have to be trading in that way and if you want to master long term trading, you also have to be trading in that way. It is when you are trading and holding that you can do both and still master them because they are two different things that you are doing. Long term trading is similar to holding because you will be holding the coin for almost the same time that you would had been holding if you are investing and not trading. I feel it should not matter how will make profits as long we can make money from any of the ways of trading. Some people can make money from short term trading and for others it has to be long term trading for them to make profits.