@{JayJuanGee, khufuking, Searing}:
I agree with your thinking, I understand that simply HoDLing will not take any advantage of the volatility, and I know I should try trading, even on a very small percentage of my stash (or some freshly-bought coins, as suggested). I could have increased my holdings by several BTC if I had sold at 4100 EUR/coin and bought back at 2500 EUR/coin. Well, it's easy to think about this after the fact, but not so easy to predict it.
Having said that, and as per your suggestion, I do intend to buy some more BTC, for the sole purpose of trading. Not much, perhaps 1 or 2 BTC. The rest is already in cold storage and I don't intend to touch them unless absolutely necessary. It's nice (very nice) when you earn from trading, but it can bite you hard if you are not careful.
BTW, just for the record, and contrary to
one of my earlier posts in this thread, I've decided to sell my entire BCH holdings, and convert them to BTC (mostly) and LTC (as a hedge). Took advantage of the recent big dip, so one could say that I "traded" them, which turned out quite good I must say. Not sure if that was a good or a bad move in the long term though... Only time will tell...