The "peach blossom wave" in the poem is a metaphor, which refers to the sudden arrival of good luck and opportunity. "Man is like a dragon" means that your mental outlook and state have become very high-spirited and spectacular, and life is full of hopes and opportunities.
The meaning of this poem is to encourage you to keep an optimistic and positive attitude and believe that you will be better in the future. At the same time, I also remind you to seize the opportunities and destiny that appear in front of you and make your life better.