Alfie has shot the Millers into third place in the league and ahead of tonight's cup replay at Luton, is hungry for more.
Speaking to The Star he said: "I'm getting in good positions and putting away my chances which is all you can ask for. I am on 17 goals but I think 30 looks very attainable now.
"I have to keep my feet on the ground and hopefully my goals will keep us up there. I am not one to think that I am too big for my boots.
"I know I need to improve certain areas of my game and that I need to prove that there is more to me than just goals. Tonight is a game we could have done without. The fixtures are starting to pile up.
"I think this will be the third week running where we have played Saturday, Tuesday and Saturday. Luton were not really adventurous when they came to our place. They just came and set their stall out and we should have really battered them.
"They are at home so they are going to have to come out and attack us. We will go there with renewed confidence and try to put in a professional performance."