Pdf generation and sending Database notifications takes too much time.

php class ProcessLetterApproval implements ShouldQueue
{

    protected $letter;

    protected $userId;

    public function __construct(Letter $letter, $userId)
    {
        $this->letter = $letter;
        $this->userId = $userId;
    }

    public function handle()
    {
        $this->letter->update([
            'status'      => 'approved',
        ]);

        $pdf = PDF::loadView('letter-template', ['letter' => $this->letter]);

        $fileName = 'letter_'.$this->letter->id.'_'.time().'.pdf';

        Storage::put('public/letters/'.$fileName, $pdf->output());


        $this->letter->update(['file_path' => 'letters/'.$fileName]);
    }

    protected function sendNotification()
    {
        $recipient = User::find($this->letter->user_id);

        Notification::make()
                    ->body("Your {$this->letter->template->name} Letter Request has been changed")
                    ->actions([
                        Action::make('index')
                              ->url(LetterResource::getUrl('index',
                                  ['record' => $this->letter])),
                    ])
                    ->sendToDatabase($recipient);
    }
}

php protected function getHeaderActions(): array
    {
        return [
            Action::make('approve')
                ->action(function (Letter $record) {
                    $this->record->update([
                        'status' => 'approved',
                        'approved_at' => now(),
                        'approved_by' => auth()->user()->id,
                    ]);
                    ProcessLetterApproval::dispatch($record, auth()->id());
                    $this->redirect(static::getResource()::getUrl('index'));
                })
        ];
    }