Keep on holding. It's often said as a joke but honestly step away from the screen for a bit, you will drive yourself crazy checking on your portfolio performance too often during a dip.

I think it depends on what your goals are. In my opinion ICO investment is a long term game requiring immense research in order to maximize results. There are no apps that will help you pick the best ICOs only your knowledge and research can get you there. That being said trading requires a similar amount of research but there are many tools and metrics to help you along the way. Long story short, ICOs have the ability to grant you the highest gains with a narrower window of success while trading is more forgiving with moderate gains considering a diversified portfolio.

If you aren't seasoned it's hard to stay focused on the goal and not let weak hands take over when we are in the trenches. This dip will pass, keep on hodling on.