This script gives a buy signal when the 21 EMA crosses above the 55 EMA and a sell signal when the 55 EMA crosses below the 21 EMA. This strategy works well for cryptocurrencies at all time frames. However, it does not work for stocks or forex. Sometimes, the simple strategies are the best strategies, especially in markets that have not been dominated by institutions.
When editing how much of your balance to trade, attach at least one decimal place. For instance, 12.0, 90.0, and 83.3 would work, but 100, 32, or 70 does not work.