If history of Bitcoin and other coins has taught us anything, there will always be another dip for you to buy. It's a trading cycle, Bitcoin rallies and people make stupid money and during this phase alt coins usually suffer.

Then once the Bitcoin run has run its course, traders cash out and buy into a low volume hype coin which is easier to manipulate because it takes less BTC to move a low volume coin up and down (whales).

This phase of altcoin growth can vary in duration, we saw an explosive growth run towards the end of 2017. I think now we're seeing the beginnings of another Bitcoin run where alts will drop, Bitcoin rallies and sets a new all time high, traders cash out and: rinse, lather, repeat.