I also have issue with taking right decision when buying coin. During this dip, I bought some matrix tokens at $0.3 and just a week after, the token I bought at $0.3 dropped to $0.18 then I began to blame myself that I should have waited. In conclusion, its not possible to get the best time to buy a coin because no one knows when the price fall will stop.
It is best not to take action on the first analysis. It is better to wait and watch the market to understand which way it will move on.