Price of Waves is going down continuously. It's really traumatic situation for those who have Waves in their portfolio. Waves have volatility thus risk tolerance is on higher side. Right now 100 Waves = $214. I think you should hold waves for 3-5 months and wait for positive changes in price. After December most probably prices will go up. 
It will not go on for a very long time. Waves is a marvelous platform, and the altcoin will gain much. It will happen during the bull run, in 2019-2020 as I think.