Can we expect Bitcoin and other types of coins to have good prices at the end of this year because 2018 will end. I'm starting to worry that next year will experience the same thing 
Be sure that the first part of the next year will be the same. It's obvious from any point of view. Besides it's good for the market. We need to get rid of those who "get disappointed" in crypto and of speculators and other hamsters. Only after that the market will start to grow.