how to use if else on the laravel controller

if will display successfully added data else the data entered is incorrect

public function store_perorangan(Request $request)
    {

    $this->validate($request, [
        'img_pengalaman' => 'required|file|max:2000',
        'img_npwp' => 'required|file|max:2000',
        'img_pph' => 'required|file|max:2000',
        'img_keahlian' => 'required|file|max:2000',
        'img_domisili' => 'required|file|max:2000',
        'img_ktp' => 'required|file|max:2000',
        'img_no_rek' => 'required|file|max:2000',
        ]);

    if return redirect ('/profile')->with('alert-success','Berhasil Menambahkan Data!');    {

    }
    else{
        return redirect ('/profile')->with('alert','Data yang anda masukkan lebih dari 2mb !');
    }
}

please help me