Yeah crypto world has seen better dayz,but dont be panic if you invested money in crypto.Main rule for my is: never sell cheaper then bought.Sounds very simlpy ha?But it's very important thing if you want avoid loss of your money,so if you started crypto trading you must be patient or not invest at all (of course if you won't loss money).
For my vision dumps like this are very good opportunity to buy some more crypto with fiat money,its more better then exchange one coin to other,BTW I can advice you very good crypto market - EXMO which is supporting USD, EUR, RUB and some other currencyes so you can X your fiat money with it