I couldn’t offer fajr for the past one month due laziness. What can I do??
What do you mean “what can I do?”
You are in deep trouble as this is a clear sign of hypocrisy and you are in real danger of going to hell! If you had a flight at that time, you would never miss it!
Sleep early and drink a lot of water before going to bed and ask Allah to save you from being among the hypocrites.