Waves is a coin that everybody should hold for a long time because they have a great concept like Ethereum and I think they could dominate the russian market in the next couple of years!
Even though waves have not done much in value, the devs are really working hard to make this project work which is what will give it that value anyway and not just some pump and dump project that at the end their prices cannot be sustained. I am sure if the OP knows what he needs to know about waves, he won't even be here confused. This is a good and solid project that one should have in their portfolio.
Waves is a good project and even though development has been a little bit slow, they still have something good going for them. A project like this usually last anyway, but at the end of it all, it depends on you. I am sure you bought for the long term, so if you feel you are selling at the price you know you are happy with, then you can go ahead, if not, just hold.