Bollinger Bands with SMAs, MFI, and Volume

managing long positions based on the 9, 21, and 50 simple moving averages (SMAs) into the Pine Script that already includes Bollinger Bands, we need to define the following conditions:

Long Position Conditions:
Enter a long position when the 9-period SMA crosses above the 21-period SMA.
Confirm the long position when the 9-period SMA bounces off the 21-period SMA.
Maintain the long position if the 9-period SMA crosses above the 50-period SMA.
The position remains long if the price retraces and then bounces off the 50-period SMA.