you must not have enough knowledge before starting trading. I have seen many people becoming rich thanks to trading. You need to spend more time to learn about trading before getting use to it. well, holding your coins is not a bad idea, but you will lose a chance to earn even more money 
Hehe, honestly day trading always better than holding in long term about profit and base price, however your health will decrease after long time working with day trading (because your emotion easy affect if the price of altcoin you trading not happening like your predict) 
We need to sacrifice something to make money. You have big investment then no need to sacrifice your health just invest money and wait for a couple of years. Or you want to become a day trader then you must spend a lot of time in trading. Ofcourse it will spoil your life by giving many shocks per day. You can able to control your tension then it will be possible but not sure.