Dual Indicator Mean Reversion Trend Following Strategy

/*backtest
start: 2024-01-01 00:00:00
end: 2024-01-31 00:00:00
period: 1h
basePeriod: 15m
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=4
////////////////////////////////////////////////////////////
//  Copyright by HPotter v1.0 02/02/2021
// This is combo strategies for get a cumulative signal. 
//
// First strategy
// This System was created from the Book "How I Tripled My Money In The 
// Futures Market" by Ulf Jensen, Page 183. This is reverse type of strategies.
// The strategy buys at market, if close price is higher than the previous close 
// during 2 days and the meaning of 9-days Stochastic Slow Oscillator is lower than 50. 
// The strategy sells at market, if close price is lower than the previous close price 
// during 2 days and the meaning of 9-days Stochastic Fast Oscillator is higher than 50.
//
// Second strategy
// The Market Facilitation Index is an indicator that relates price range to 
// volume and measures the efficency of price movement. Use the indicator to 
// determine if the market is trending. If the Market Facilitation Index increased, 
// then the market is facilitating trade and is more efficient, implying that the 
// market is trending. If the Market Facilitation Index decreased, then the market 
// is becoming less efficient, which may indicate a trading range is developing that 
// may be a trend reversal.
//
// WARNING:
// - For purpose educate only
// - This script to change bars colors.
////////////////////////////////////////////////////////////
Reversal123(Length, KSmoothing, DLength, Level) =>
    vFast = sma(stoch(close, high, low, Length), KSmoothing) 
    vSlow = sma(vFast, DLength)
    pos = 0.0
    pos := iff(close[2] < close[1] and close > close[1] and vFast < vSlow and vFast > Level, 1,
	         iff(close[2] > close[1] and close < close[1] and vFast > vSlow and vFast < Level, -1, nz(pos[1], 0))) 
	pos


MFI(BuyZone,SellZone) =>
    pos = 0.0
    xmyVol = volume
    xmyhigh = high
    xmylow = low
    nRes = (xmyhigh - xmylow) / xmyVol * 10000
    pos := iff(nRes > BuyZone, 1,
             iff(nRes < SellZone, -1, nz(pos[1], 0)))
    pos

strategy(title="Combo Backtest 123 Reversal & Market Facilitation Index", shorttitle="Combo", overlay = true)
line1 = input(true, "---- 123 Reversal ----")
Length = input(14, minval=1)
KSmoothing = input(1, minval=1)
DLength = input(3, minval=1)
Level = input(50, minval=1)
//-------------------------
line2 = input(true, "---- MFI ----")
SellZone = input(6.2, minval=0.01, step = 0.01)
BuyZone = input(1, minval=0.01, step = 0.01)
reverse = input(false, title="Trade reverse")
posReversal123 = Reversal123(Length, KSmoothing, DLength, Level)
posMFI = MFI(BuyZone,SellZone)
pos = iff(posReversal123 == 1 and posMFI == 1 , 1,
	   iff(posReversal123 == -1 and posMFI == -1, -1, 0)) 
possig = iff(reverse and pos == 1, -1,
          iff(reverse and pos == -1 , 1, pos))	   
if (possig == 1 ) 
    strategy.entry("Long", strategy.long)
if (possig == -1 )
    strategy.entry("Short", strategy.short)	 
if (possig == 0) 
    strategy.close_all()
barcolor(possig == -1 ? #b50404: possig == 1 ? #079605 : #0536b3 )