I think you are right. Most market will act likes a Sinx shape. Bitcoin has touched the top in 2017 and now it must reduce to the bottom. you should not be worried and lets buy and hold coins now.
What is the correction you are expecting on bitcoin mate. I see the investors are really supporting the value to grow more in the market. Please refer the good market value analyzing site and invest the coin you like. If you feel the coin value is cheap on the concern potential coin.
Please invest your money to the avoid the price fall and correction in the crypto market.
I have around 4 bitcoins in my blockchain wallet. I expect that to reach 10k USD or even more.