lights glare on iPhone

I don't see another one.

Make sure the lens is not greasy.

The original one does look rather excessive.

The other thing to remember is low light photos can gave anything up to 2 seconds exposure. You can see it count down. There is something called optical image stabilisation OIS on most iphones which is like a virtual tripod but it can only take small amounts of movement. Particularly on 12 and 13 night mode. Hold the phone still til the exposure completes.

If you still have excessive "smears" take the phone to a Genius bar or arrange a service.

repair

https://support.apple.com/iphone/repair/service

Anything other than Screen or Battery may be a replacement phone and the price is in the article for out of warranty phones.

You can see additional service information within the following article:

Prepare your iPhone for packing and shipping

You are attempting an impossible shot. Avoid subjects in dark areas with bright light point sources.