I believe that we progress by the free will choices we make in this life, and that the primary purpose of this life is to know and love God, but I believe we
continue to progress towards God after we die and enter the spiritual world, where we will take on another form, a spiritual body.
“And now concerning thy question regarding the soul of man and its survival after death. Know thou of a truth that the soul, after its separation from the body, will continue to progress until it attaineth the presence of God, in a state and condition which neither the revolution of ages and centuries, nor the changes and chances of this world, can alter. It will endure as long as the Kingdom of God, His sovereignty, His dominion and power will endure. It will manifest the signs of God and His attributes, and will reveal His loving kindness and bounty.” Gleanings From the Writings of Bahá’u’lláh, pp. 155-156
All that said and quoted, I do not know exactly
how we will progress without free will and the ability to make choices, that is a mystery. The Baha'i belief is that we will only be able to progress by the grace of God, the prayers of others, and good works done in our name, but I tend to believe there is more to it than that.
Nevertheless, it makes some sense to me that we will no longer have free will as we know it in this life, since free will is primarily for the purpose of making moral choices, by which we can grow spiritually. I believe that when we die physically and enter the spiritual world we will be whoever we have become in this world and we will start to advance from that point on. We will begin to develop along a new line but we will not be able to get what we did not get in this world and that is what makes this life so very important for attaining spiritual growth. An analogy that has been given is that we are developing our spiritual arms and legs in this world just as a baby in the womb develops physical arms and legs, and just as the baby will need those arms and legs to walk, we will need our spiritual arms and legs (the spiritual attributes we have acquired in this world) to be equipped for life in the spiritual world.