In December 2020 issue of TASC, John Ehlers published an indicator called MyRsi with NET (MyRsi with Noise Elimination Technology) in which he uses a sort of Kendall (auto)correlation to filter out signals
The only deviation in this version is that we can use desired prices (instead of using fixed close price)

Recommendations:
MyRsi
MyRsi - by John Ehlers
The Hilbert Oscillator Indicator
The Hilbert Oscillator Indicator was created John Ehlers in "Rocket Science For Traders", pg.90-91
Rex (extended)
Rex indicator extended version
Position Size Calculator
MT5 Indicator for Position Size Calculation