How to redirect after downloading pdf using fpdf

Is there any approach to redirect to certain route/ refresh current page after download the pdf? I've tried to return an URL but it just goes to the url without generating the file. If I use the code below, it will generate the file and display a blank page. I am using laravel and fpdf here.

Route:

Route::post('alumni/labels','AlumniController@labels')->name('alumni/labels');

Controller:

public function labels(){
            $alumni = Alumni::whereIn('id', Session::get('alumniId'))->get();
            $pdf = new PDF_Label('TJ103');
            $pdf->AddPage();
            foreach ($alumni as $alumnus) {
                $text = sprintf("%s %s\n%s\n%s %s", $alumnus->firstName, $alumnus->lastName, $alumnus->address, $alumnus['hp1'], $alumnus['phone']);
                $pdf->Add_Label($text);
            }
            return $pdf->Output('d');
 }

View:

<form method="post" action="labels">
                    {!! csrf_field() !!}
                    <button class="btn btn-primary" id="btn-submit">Generate Label</button>
                    </form>

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