What is the next step after going through Invisalign on my upper teeth?

I have gone through all the trays for my upper teeth and have another 12-14 on my lower teeth, to go. What is the next step after for my upper? I still have composite and pins left on upper as o continue on with the rest of my lower. I previously had concerns about my dentist not checking on my progress with invisalign. I'm starting to think he does not need to check up on me, after I paid him. I will make sure i voice my opinion and ask more questions. Just very frustrated here.