Citizenship delay

Hello Guys,
I submitted citizenship application on 21.06.2019 and did biometric a week after the submission. I got an email after two weeks of the biometric that HO received my application and my case is considered and waiting for the decision. It mentions that it might take 6 months for the decision to be make.
Now it is 5 painful months and have not heard any thing from the HO and did not receive approval letter yet.
Is there one who applied around the time i submit app and have not heard yet? Is there any reasons for the delay. I'm worried so much.
Thank you

Wait to hear back. Most cases are decided within 6 months but some cases may take much longer. Every application is separate and will be decided on its own timeline