Redirect after download file laravel 5.7

Hello there

Hope you will be doing well.I want to redirect to a route after file download but as we know that return only works once in a controller method how i can achieve this with laravel 5.7.I have to set a session and display it when data exported in txt file.I want this with post method. Every thing is fine but redirect is not working;

Controller Method

public function exportTxtProcess(Request $request){


       $table  = $request->tblExportSelect;

        $destinationPath = public_path('/');

        $result;

        $outputs   =  DB::select("SELECT * FROM $table");

          $today   = date("Y-m-d");
          $fileName  = $table."-".$today;
          $fp = fopen($destinationPath . "$fileName.txt","wb");

          foreach ($outputs  as $output) {
            $output  = (array)$output;

            @array_shift($output);

            $removeUserId  = @$output['user_id'];
            $created_at    = @$output['created_at'];
            $updated_at    = @$output['updated_at'];

            if (($key = array_search($removeUserId, $output)) !== false) {
                unset($output[$key]);
            }
            if (($key1 = array_search($created_at, $output))) {

                unset($output[$key1]);
            }

            if (($key2 = array_search($updated_at, $output))) {

                unset($output[$key2]);
            }

            if (is_null($created_at) OR $created_at == '') {
                unset($output['created_at']);
            }

            if (is_null($updated_at) OR $updated_at == '') {
                unset($output['updated_at']);
            }


            $netResult = $this->getTableFields($table,$output);

            fwrite($fp,$netResult);

          }

          $result = fclose($fp);


          if ($result) {
            $pathToFile  = $destinationPath . "$fileName.txt";

            $redirect  = redirect()->back();
            $sess =  Session::flash('success','Table exported successfully');
            return response()->download($pathToFile)->deleteFileAfterSend(true);


          }

    }

Thank in advance

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