Hi, i am wondering if i should buy a little bit of top 20 coins at current prices, 8th dec 2018, or wait until the market gets lower. What do you guys do?

I have bought the current dip, or at least... when market cap was still around 120 billion usd. Following my policy to buy after huge drops only, i planned to buy the next dip if market cap is around 60 billion usd. But should i not buy the current dip twice? Because what if the bakkt launching next month is succesful? What if it gets followed up by the ETF getting approval in the february sec-decision? What if it all comes paired with new developments that occur? Is this a realistic scenario for short-term?

What would you do, if you were following my plan/policy? I don't buy with large amounts so i can take some losses, what do you think is best?