There are a few things that could be wrong with your bash script.

First, make sure that the source directory and destination directory exist. You can do this by running the following commands:

```bash
ls $src_dir
ls $dest_dir
```

If either directory does not exist, the script will not work.

Second, make sure that the script has permission to access the source and destination directories. You can check this by running the following commands:

```bash
ls -l $src_dir
ls -l $dest_dir
```

If the permissions are incorrect, you can change them using the `chmod` command.

Finally, make sure that the `find` command is working correctly. You can test this by running the following command:

```bash
find $src_dir -name "*.txt"
```

This should list all of the .txt files in the source directory. If the list is empty, then the `find` command is not working correctly.

If you have checked all of the above and the script is still not working, then you can try adding some debugging code. For example, you can add the following line before the `find` command:

```bash
echo "Finding .txt files in $src_dir..."
```

This will print a message to the console before the `find` command is executed. If the message is not printed, then the script is exiting before the `find` command is executed.

You can also add the following line after the `find` command:

```bash
echo "Moving .txt files to $dest_dir..."
```

This will print a message to the console after the `find` command is executed. If the message is not printed, then the script is exiting before the `mv` command is executed.

Once you have added the debugging code, run the script again and see if you can identify the problem.

Here is an example of a bash script that finds all .txt files in a specified directory and moves them to a new directory:

```bash
#!/bin/bash

# Get the source and destination directories from the user.
echo "Enter the source directory:"
read src_dir

echo "Enter the destination directory:"
read dest_dir

# Check if the source and destination directories exist.
if [[ ! -d "$src_dir" ]]; then
  echo "Source directory does not exist."
  exit 1
fi

if [[ ! -d "$dest_dir" ]]; then
  echo "Destination directory does not exist."
  exit 1
fi

# Find all .txt files in the source directory.
find "$src_dir" -name "*.txt" | while read filename; do

  # Move the file to the destination directory.
  mv "$filename" "$dest_dir"

done

# Print a message to the console.
echo "All .txt files have been moved to the destination directory."
```

This script is more robust than your original script because it checks for errors and prints informative messages to the console.
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