Long term of not, ignoring the dip and market signal as a whole doesn't seem like a good strategy to me. Sure we all know how Bitcoin is for the long term and eventually climb back and hit a new ATH. Though, looking for the best possible price both in the short and long term to reduce the risk is more sensible.
Maybe not ignoring the decline but how we can look for market signals that we think are a good time to enter the market. But if we can see a decline in the market, we can analyze it further to find the time to buy and vice versa. Bitcoin does have a chance to go high and reach a new ATH but we don't know when and as long as the decline occurs, it's a good time to buy bitcoin and hold it until the price goes high and sell it at a high price.