Are we considering $66K a dip now?
I don't think $66k is the deepest as the price could decline further. Moreover, the price now shows no signs of increasing again. Everything can still happen, so prepare for something worse than now.
The price may continue declining until it is time for the halving. After the halving, the price will go sideways until people get bored waiting. Only then will the price increase slowly from up to down.
When people don't think much about the price of Bitcoin, that's when the price of Bitcoin can start to increase rapidly.
Following the price sometimes can be a little disturbing, even with the ideas buying should always come first. Bitcoin price is unpredictable that's why it's advisable no one should play with his/her investment. If we're considering $66k a dip it's never too late to buy now. Let's consider earlier price as the main dip comparing with the current price.
Investing should not necessarily mean profit.
You will get some sort of return from the investment, may be dividends or may be learning. Not everyone succeeds in investing all the time, some succeed and some fail and learn from failure and move towards success.
But one should not invest in a situation where he has no source of income and is totally dependent on his investment.
When it comes to bitcoin investment, there's this saying "the way you lay your bed so you lie on it" bitcoin investment has nothing to do with failure at first start except you're referring to altcoin projects. Bitcoin investment still doesn't allow an investor to depend on their investment and accumulating at the same time except you're the type of investor that want a quick profit but I still don't think it can workout. We talked about profit making and taking out early and it's not perfect when having a low accumulation level, for example, an investor can decide to invest in bitcoin with a selfish aim of making fast profit or like what you said in your last paragraph but the end result is nothing.