You're coming along nicely
This isn't a hobby for the faint of heart
From your image above I'd say that one of your biggest and easiest image improvements would be to get the focus correct. It is off a bit at the moment, every star looking like a mini-donut
Because it looks like you're using a refractor without a flattener you do need to focus at the very centre of field. If you can get the centre of field to tiny pin point stars you'll be surprised at just how much more the image will pop out