Ema crosses do not work in the long term. They have their value, however they should not be used to pinpoint entry and exit. Price action should allow for those decisions and let EMA’s guide you along the proper direction in the trade.
It may be difficult to grasp this idea at first, but moving averages do not mean anything in terms of entry and exit. A moving average simply reflects prior data, usually a candle’s close, and plots it on a line. I’ve used various EMA’s on the 5 minute setting, 5/10 EMA, 10/20 EMA, 5 Close/9 Open EMA, etc. They all lag and break down easily. Thing is, moving average crossovers work beautifully in trending markets but are complete garbage in range-bound/choppy markets. Once you can determine if a market it trending or choppy, moving averages lose their value. You’ll learn all of this in good time.