Hi.
my camera is a Nikon D750 DX format sensor.
There is a typo in that sentence, and it's important. The D750 is an FX full-frame camera. The D7500 is a DX crop-sensor camera. The difference is important. I assume you have the D7500.
I’m a complete novice where photography is concerned but am learning. I use use the camera for taking photographs of my local football team and they are published in the sports section of the papers. I have a. Wide angle lens which I rarely use and the 70-300mm zoom. i need a bog standard lens to just take ordinary shots. Budget is variable depending on quality.
It's difficult to recommend a lens because "budget is variable" and "ordinary shots" is too arbitrary. Are you willing to spend $1000? $2000? And for ordinary shots of what? Buildings, flowers, landscapes, people, cars? If you can be more specific about what you want to do, you will get better suggestions.
My guess is that a lens like the Nikon 35mm 1.8G DX or the Nikon 50mm 1.8G FX would be a good place to start. The 50mm is a classic lens for photographers to start with.