How reliable are moving averages?

I got maximal profit in demo by Moving average but
when I tried it in live account didn’t get result as like before.

21 EMA and a 200 EMA on 5min 1hr 4 hr and D charts is the only indicator i use. EMAs are amazing tools they can tell you how long a trend is how strong the trend is (the stronger the move the farther it moves off the EMA) Can identify if a market is range bound (sideways or small up and down movement)

I have worked in demo account so I know MA gives you perfect results when I have tried it. But I do not know if it works in real account also.