Interstellar Traveler

Humans have always tried to use steam engines to create a 'steampunk' landscape. This 'genetic engineering technology tree' path has been the most suitable and unique path for them since their birth. This race was meant to take this path. It's just a matter of time. Other races can't do this, and they don't randomly cut their own genes. One mistake can cause disaster. If you lose one part, the whole thing will fall apart.
Any genetic fragment can be that building block. So, even a small change to the genes is risky, let alone something as extreme as this. Genes are as complex as the stars. People can now fine-tune and repair their genes. This has allowed them to experiment with genetictechnology. They are more sensitive and inspired than other life forms when it comes to cutting their own genes. Some are taller than skyscrapers, while others are as small as Thumbelina.
They are still the same species at the genetic level. They have been on the road of modern technology' for a long time. They have explored every planet around their mother star and even tried to find the original energy of life.