I think that bitcoin will reach the level of December 2017 in the first quarter of 2019. In autumn and winter there will be a slow pamp.
I am way too optimistic about that as well. Bitcoin is slow right now and a slow growth in the value of Bitcoin might not enable it to go beyond the last years prices but I hope that as we approaches the end of the year, the idea of boom in the crypto market will become more obvious so even if the growth in Bitcoin were not as high as the last year, it will definitely cross the said value in the start of the next year. There are so many possibilities.