I could be wrong on this, but for me....

It looks like that institutions were trying to collect shares before NVDA's earning. Every time it touched 196-198 +/- in last 4 trading sessions, it bounced off. That was also the area where it broke up to 220 last time.

If you do short term trading, you want to sell only if that area is broken down

if you are long term holding, it makes no sense to sell a great company at PE of 21-22.

No one can time the market or stock, the only thing we can do is to figure out are you doing a short trade or hold for long term. That is the decision we can make