200sma

I have been looking at the 200sma in relation to price.

E.g. if price is above the 200sma on the 4hr and 1hr but the price is below on the 15minute it would appear that this could be a buy signal to go long. vice versa.

At what point would the price have reached its target to get out. would the rsi be the indicator to use on the 4hr to indicate this.

It would appear as if there may be some merit to trade this way.

Any comment would be appreciated.