Well I think a trading bot following a strategy is way better than its human counter part. But finding a good strategy is pretty hard. I would suggest using the backtesting to verify that your current settings would have made profit in the past.

You can also use Gekko to do paper/simulation trading (with a bunch of settings simultaneously for example), this way you know whether a strategy is currently effective. Do note that you are always looking a the success after a while, in which case the success lies in the history and won't guarantee anything anymore for the future.

EMA is a indicator that you can use to ride the trend (buy low - sell high), however because it uses moving averages to verify the trend it is always lagging behind. This in combination that trends can reverse at any time makes it so that you don't always make profit while trying to ride the trend.

To answer your question: I am currently on a 10% profit measured in BTC in a little over one month.