How much of a stock drop is enough to make you buy?

Current % drop similar to its last % drop

I bought 3 stocks at their historic high.

Amazon in 2017 at $1000

Google in 2015 at $1080 pre-split

Tesla in 2014 at $260 pre-split

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I don't think Amazon and Google ever went below that price after purchase, so I would've lost on opportunity cost if I was waiting for a drop.

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Tesla did go down, it was my paper loss for a few years, I would've earned more if I waited for a drop.

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Summarizing these 2 completely opposite experiences, I've come to the conclusion that I can't predict the price, there is no ideal drop followed by a magical climb. For growth companies, the less nerve-wracking way is to play the long game, pick good companies, and let them earn you money.

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However, if a good company has a sudden drop, I would still pounce on it. The question is whether I trust the company will still grow in the long run despite some random target misses.

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Use Fib retracement to identify entry points. Increase buying positions the lower it goes down the fib levels or split into 1/3 entries. Either way you never know how low it can go, but if fundamentals of the stock and your conviction hasn't change, just DCA into it.

Like Marcus below, if it's in my watchlist of must buy then there is any sentiment which is unjustified which causes the stock to drop, then i will buy.

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ie. I have a COVID recovery portfolio which I am monitoring closely as the Omicron virus thing i think is transient in nature