Overlaying sine waves on top of a long-term weekly chart of Bitcoin suggests that the price could have already peaked for this time period and the next dramatic rise will not occur until 2020.
Of course, this is only hypothetical based upon previous price movements. The result of the BTC ETF (due March 11th) if successfully passed could likely lead to a new price paradigm.
If we see BTC keep upward momentum outwith the red sine wave then we know that it is exceptionally bullish and ready for new highs in 2017-2018. On the other hand, if the price continues downward, we can expect a test of the bottom around August 2018 and test of a new high around February-March 2020.