You can let go of your desires in different ways. You can throw them aside with anger, like stones. You can, like a juggler, happily throw up, and then catch back. You can, like a fisherman, do good and throw it into the water. You can, like a sower, sow good and light.
The narrow gate is a metaphor for the fact that excesses will spoil everything. You need to go on the road at a minimum and try to solve all your problems with a minimum of funds. Faith the size of a mustard seed is enough to plant a barley seed and grow the Kingdom of heaven. The narrow gate is a symbol of restraint, when a person pacifies the greedy hunger of his pride and directs his demon to the right path.