It depends on your own circumstances. If you have fiat debts you'd like to clear then cashing some out to make your life better in the immediate is fantastic. If you believe in the tech, and want to be part of something special then holding could be the best option. I believe we are quite far away from mass adoption at the moment, and that would be a time where you'd see more people using cryptocurrency as everyday currency.
For me personally, I am holding on to my investments as I don't trust myself to trade at the right points, but I really do believe that I will be in a good place in the long term.