【Laravel】マイグレーションを実行する際に出たエラーを解決したいと思っています。Illuminate\Database\QueryException SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name

 Illuminate\Database\QueryException 

  SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'last_name' (SQL: alter table `users` add `last_name` varchar(10) not null, add `first_name` varchar(10) not null, add `employee_num` int unsigned not null, add `admin_flg` tinyint(1) not null default '0', add `job_type_id` bigint unsigned not null, add `hire_date` datetime not null)

  at vendor/laravel/framework/src/Illuminate/Database/Connection.php:712
    708▕         // If an exception occurs when attempting to run a query, we'll format the error
    709▕         // message to include the bindings with SQL, which will make this exception a
    710▕         // lot more helpful to the developer instead of just the database's errors.
    711▕         catch (Exception $e) {
  ➜ 712▕             throw new QueryException(
    713▕                 $query, $this->prepareBindings($bindings), $e
    714▕             );
    715▕         }
    716▕     }

php artisan make:migration add_columns_to_users_table --table=users

public function up()
    {
        Schema::table('users', function (Blueprint $table) {

//　メアドは50文字までかつ 正の値かつ 一意に変更
            $table->string('email',50)->unsigned()->unique()->change();

//　パスワードは30文字までに変更
            $table->string('password',30)->nullable()->change();

//　food_idは正の値かつ user_id の外部キーに指定
            $table->bigInteger('food_id')->unsigned()->foreignId('user_id')->constrained('users');

//　デフォルトの名前は削除
            $table->dropColumn('name');
  });
}

composer require doctrine/dbal

php artisan migrate

SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'last_name' 

$php artisan migrate:status