Jesus promised that we would grow into fullness of life by His Spirit. Like many things in life, that growth is not linear, but happens in seasons and cycles. Neither is there simple set of steps to follow guaranteeing maturity - that would be too impersonal for a God who loves relationship.
Instead, spiritual growth comes from understanding some basic spiritual truths more and more profoundly. We come back to the same places again and again, each time experiencing them more deeply. This simple, but profound approach to growing in God will reinvigorate your faith and answer many questions about how to develop a vibrant spiritual life.