My-strategy-doesn-t-trigger-a-buy-when-price-breaks-above

I'm coding the follow backtesting:

Buy strategy:
When the Price of 2 days ago closed under of UpperBB and the Price of yesterday closed over of UpperBB and the volume of yesterday Closed over of SMA21[volume] then, buy when the Price of today cross over of the High Price of yesterday

Sell strategy
Trailling ATR 10

I didn't understand why the strategy doesn't works in the example attached. Probably I'm missing something.

CODE:

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;
using WealthLab.TASC;

   namespace WealthScript9 {

   public class MyStrategy : UserStrategyBase
   {

      public override void Initialize(BarHistory bars)
      {
         
         BBUpper = BBUpper.Series(bars.Close,21,2.00);
         PlotIndicator(BBUpper,Color.Red);
         
         smaVolume = SMA.Series(bars.Volume, 21);
         PlotIndicator(smaVolume, Color.Blue);

         stopATRHigh = ATRTrail.Series(bars, 20, 2.00);
         PlotTimeSeries(stopATRHigh, "ATR10", "Price", Color.Black);
         
      }
      
      public override void Execute(BarHistory bars, int idx)
      {
         if (idx == bars.Count - 1)
            return;

         if (idx < 21) return; 
         
         if ((bars.Close[idx - 1] < BBUpper[idx - 1]) &&
             (bars.Close[idx] > BBUpper[idx]) 
            && LastOpenPosition == null 
               && (bars.Volume[idx] > smaVolume[idx])
                  && (bars.Open[idx + 1] > bars.High[idx]))
            PlaceTrade(bars, TransactionType.Buy, OrderType.Market);
         else if (bars.Close.CrossesUnder(stopATRHigh, idx +1) && LastOpenPosition != null)
            PlaceTrade(bars, TransactionType.Sell, OrderType.MarketClose);
      }

      private TimeSeries stopATRHigh;
      private BBUpper BBUpper;
      private SMA smaVolume;
   }
}