Can you post pictures of the space?

The rule is: Fixtures placed over the doorway should be sized at 1/4 or 1/3 the width of the door frame and centered six inches above the door.

So if your door is 32" wide, you want something around 8 - 12 inches wide.

To light the front door, the consideration is where the light is directed not necessarily how far out it is from the house. Think about "dark sky lighting" which directs the light down, not all over the place.

https://www.lampsplus.com/ideas-and-advice/a-guide-to-dark-sky-outdoor-lighting/

Something simple like this might work:

I'm a big believer in buying from and talking to staff at lighting stores. They really know their stuff and will price match internet prices. If you can't do it in person, a phone call will work as lighting brands are easy to research on the internet during the conversation.