The bitcoin price runs in 4 years cycles, at least since its beginning. If it doesn't change, then 2019 should be more or less like 2015, that is, a relatively boring year of recovery in price with a mini bull run by the end of the year. The bottom should be around $5k and a few months ago, but the value is yet to be seen.
In my opinion hodl and buy would be the best strategy, because ends of year are always bullish. Then diversify a little in the altcoin markets next year and wait the next mega bull run that should happens in the year 2021.