When it comes to renewing a Bangladeshi passport, almost everyone has to face this problem because the Bangladesh Embassy is not available in all countries. The Bangladeshis who are in exile suffer. As you are in Ukraine. There is no Bangladeshi embassy there.

As a result you have to apply through Bangladesh Embassy in Poland. This is wasting a lot of your time. You said it would take 5 months. The whole world has stopped for the global coronavirus and office-court activities have decreased in all countries. It is becoming very difficult for those who will renew their passports because it will be impossible to stay in that country if they do not get their passports at the right time. Hopefully, the government of that country will sacrifice at least a little bit for the global coronavirus.