ZMZM failed at 400 last week and back-tested 390, 380. If ZM holds at the 380 level, I wouldn't consider buying calls until it breaks 400-410.
Around 390 it's best as a quick day trade, for now it is just in a range and an average trade.
Once it gets a strong close around or at the 410 level, from there it could test 424, 440.
IT IS IMPORTANT TO NOTE that on the daily chart ZM formed a golden-cross, when the 50 EMA crosses over the 200 EMA, which is a bullish indicator in itself.