After gapping up by a huge $120 dollars on August 31, ZM has come down to Earth. It finally found resistance at the horizontal support line (in the 344 range.) It has entered back into its ascending channel, and since the two parallel trendlines are very close together, expect predictable price movements.
The RSI has just bounced at its horizontal support line as well, So we can expect continued uptrend. If the price were to hit 406(The high of September 3rd) I would consider taking a short term call and wait for it to hit the low of September 2nd, $410. If I had a heavy risk appetite , I might wait for the price to hit the closing price of September 2nd, $423.