You can try using the Intervention Image package in Laravel to resize before uploading.

1. Install software package:

   Composer Needs Intervention/Image

2. Add the following code at the beginning of the file to import the required classes:

   Use Intervention\Image\ImageManagerStatic as image;

   Use Illuminate\Support\Str;

3. Modify the handleImage method as follows:

   private function handleImage($image)
    {
    $exploded = explode(',', $image);
    $decoded = base64_decode($exploded[1]);
    $image = Image::make($decoded);
   
    // Resize the image to a maximum size of 500px on the longest side
    $image->resize(500, null, function ($constraint) {
        $constraint->aspectRatio();
        $constraint->upsize();
    });
   
    // Set the file extension based on the original image format
    if (Str::contains($exploded[0], 'jpeg')) {
        $extension = 'jpg';
    } else {
        $extension = 'png';
    }
   
    $fileName = Str::random() . '.' . $extension;
    $path = public_path() . '/images/products/' . $fileName;
    $image->save($path);
   
    return '/images/products/' . $fileName;
   }