Holding for few years is just what we generally regard as investment since trading is seen from the angle of a couple of days or months before the selling. I think it is necessary to make that distinction for the purpose of the discussion because even short term investment is not too different from position trading which involved holding for several months and sometimes years.
Thinking on trading as the practice of holding only for days or up to few months before selling, makes the activity even more risky for those seeking for a reliable source of profit, at same time it becomes more similar to gambling activity. Regards short term investments in crypto industry, I fear it's not possible to name them as investments due to the unpredictability factor involved. Analysis don't work on short run here, therefore it's a better idea to focus the investments made in crypto aiming long term returns exclusively.