If you are not a whale then you may not be able to buy aggressively at all.  You'd be more confident in dumping and buying back when you think how much BTC you get while the market is still dipping.

With having just a fraction of BTC, and bought it at a higher price, you are not a whale and will have doubts because you would only be earning just few satoshis upon buying back. You are just accumulating unlike the whales that they can affect the market when they sell.