I think I talk about this in one of the lessons. Pick out some melodies that really KNOW. It can be anything, but "classic stuff" tends to work better; Star Wars Theme, Somewhere Over The Rainbow, etc. Rock melodies tend to be bland and linear.
Try to play them cold. Then spend some time working them out. This will help get your ear connected to your fingers.
Also - spend time identifying intervals; a 5th, a 4th, a Major 3rd, a minor 3rd, a b5, etc. There are apps that generate random intervals. You guess and then it gives you the correct answer.
You probably have a bit of ear training under your belt right now. If I played a D chord, you could probably identify the next chord if I played a G. It's just a matter of expanding on that and being able to identify more difficult changes - like D to Bb.
Hope that helps.
Cheers!
pg