Are the saints in heaven free, or do we lose our free will in heaven? Why?
Free to do what?
The only ones going to heaven are those who are "faithful unto death", their will is the do the will of the Father. They love the Father with all their hearts, soul and mind.
We become a Christian because we love God and Jesus. We are followers of Christ, we are espoused to Jesus our head.
We are in training today as a Christian for what our job will be in the future.
Heaven is not a big party. Heaven is not sitting on clouds reading books, painting and sculpting.
We are called to be Kings and Priests in the Kingdom which we pray to come.
We have a job--that is restoring all of mankind back into harmony with God. The harmony which Father Adam had before he sinned.
Heaven is not about self.