I am waiting for the decision already 6 months and I now I have a really urgent case so that I have to travel to my home country. Is there any way to speed up the case?

Yes, you should write a request to speed up the proceedings and describe your situation in great detail. Please note that all the documents submitted to the Office, including the letter of request, have to be in Polish. Then your case should be considered individually. More information on this topic can be found on the website of the Association For Legal Intervention.