Code help!!!

Hi ! I wrote this code where if the RSI2 reaches level 90 and if the previous RSI is below 90 the arrow appears. I wish that after the first signal, the indicator revalue the situation after X number of candles and if the RSI2 again is> = 90 the arrow reappears, otherwise you break the cycle. Thank you.

#property indicator_chart_window
#property indicator_buffers 1

#property indicator_type1 DRAW_ARROW
#property indicator_width1 1
#property indicator_color1 clrAqua
#property indicator_label1 "Buy"



//--- indicator buffers

double Buffer1[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
   IndicatorBuffers(1);
   SetIndexBuffer(0,Buffer1);
   SetIndexEmptyValue(0,0);
   SetIndexArrow(0,241);


   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
   int limit=rates_total-prev_calculated;
//--- counting from 0 to rates_total
   ArraySetAsSeries(Buffer1,true);

//--- initial zero
   if(prev_calculated<1)
     {
      ArrayInitialize(Buffer1,0);

     }
   else
      limit++;

//--- main loop
   for(int i=limit-1; i>=0; i--)
     {
      if(i>=MathMin(5000-1,rates_total-1-50)) continue;

      //Indicator Buffer 1
      if(iRSI(NULL,PERIOD_CURRENT,2,PRICE_CLOSE,i)>=90
         && iRSI(NULL,PERIOD_CURRENT,2,PRICE_CLOSE,i+1)<90)

        {
         Buffer1[i]=Low[i]-20*Point();
        }
      else
        {
         Buffer1[i]=0;
        }

     }
   return(rates_total);
  }
//+------------------------------------------------------------------+