for this coin investment I plan for short-term but regular investment because the results are quickly enjoyed
Indeed, short-term investment will offer less time on earning profits with the coins you are holding.
I'm holding Oyster Protocol PRL and the price is very volatile and this kind of volatile coins are million circulation supply. Thus, I could use this PRL for trading to have a chance to earn more than long-term coins or Billion supply coins.
Both short term and long term has its own advantages and disadvantages. Actually you don't need to choose between two. I divided my portfolio to half. I'm doing long term investment with the first half (it means no touch whatever happens in the market) and second half I do day trading.