Q: How to make conditional constructor statement within a controller in laravel

I have a controller which uses two models of authenticatable type of users, if i’m authenticated as an applicant it successfully renders the applicant.index view, and the same thing goes to if I’m authenticated as an Employer. The issue for me is when I’m not logged in and visits the /app it renders empty page.

How can protect this route and redirect to for example '/' route.

A controller that indexes two models with two different views:

class ProfilesController extends Controller
{

    public function index()
    {

    if (auth('applicant')->check())
    {
        
        $applicants = Applicant::where('id', '!=', Auth::guard('applicant')->user()->id)->get();
        return view('applicant.index', compact('applicants'));

    } elseif (auth('employer')->check()) {
        
        $employers = Employer::where('id', '!=', Auth::guard('employer')->user()->id)->get();
        return view('employer.index', compact('employers'));

    }
    }
}

using this following route:

Route::get('/app/', 'ProfilesApplicantController@index');

I have tried this piece of code but it’s not working :

public function __construct()
    {
        if (auth('applicant')->check())
        {
            $this->middleware('auth:applicant');
        } elseif  (auth('employer')->check()) {
            $this->middleware('auth:employer');
        } else {
           return abort(404);
        }

    }

the else statement takes over even if i’m authenticated and returns 404.

'auth:applicant,employer'