Don't be discouraged, any transit capture is a good one. I've attached the prediction of the event and it is low and as a consequence very distant. All those amazing ISS shots are taken when the moon (or sun) is overhead and the ISS is only about 400km away and therefore much larger in angular size.
As it is a moving object, exposure length is critical and needs to be as short as possible even at the expense of gain noise. Use ROI too which will increase frame rate, there is no point capturing blank space around the target.
Keep practising on any events you can - when that really good one comes along, you want to be on top of your game
