The stock market can go on aggressive runs and rallies, but should you commit your capital fully to each one, and do so blindly?

There are some stock market rallies that are made to be aggressive with, and others that require that you be more on the conservative side. I use the current market rally that we are on right now as an example of why I was more conservative in my approach despite a market that was increasing in value at a very rapid pace to new all-time highs.