Use any line on any chart. Use arc's, fib's, Gann angles. Andrews pitchfork.
Moving averages of whatever concoction you can come up with.
Tema's, dema's, reversion, forward fibs, square of nine, etc etc etc etc etc etc etc etc etc etc etc etc etc etc etc etc, and so on.
They all work and look very pretty (in hindsight)!!!
Now look at the same chart. Mark off the times when it DOESN'T work!!!
Oh dear! another system out the window.
Price will tell you what price is doing. Why do you need another "INDICATOR" to tell you what price is doing?
Want a simple system for any timescale you want to trade?
Take ANY timeframe. Draw a horizontal line at any point you want. Go long above and short below.
That is the only true basis for a method. Of course it needs tweeking. Use support and resistance of the PRICE itself.
Don't expect it to work perfect first time. YOUR timing may be off!