Everything we know about biological sciences, medicine, agriculture, disease, whatever, is based on studying one example of life. Life on Earth. Life as we know it. If we find another example that’s different, a second genesis, and independent origin of life, comparing those two might enable us to answer questions that we would never be able to answer if we only had one example to study. That could provide practical benefits for humans as well as better understanding of how to manage ecosystems, etc.
My main goal is not to die in the first place. I hope to keep living, hopefully long enough that science will have solved the aging problem and I won’t have to die. But since I don’t know how long that’s going to take, cryonics is the real backup policy for me.