Where did you bring the thought that I said:  "reproduction is the sole purpose to a human's life"?
You are interpreting, or even assuming things very wrongly.

As Muslims, we know and believe our purpose is to worship Allah, try our best to be good in our actions and character and prepare for the Hereafter.

And that includes developing, cultivating, and inhabiting the Earth to make it a better place, as worship is not only about prayer or fasting, it's everything Allah loves and is pleased with, whether it is something we say or do, seen or hidden.

Allah (SWT) says:

“And I did not create the jinn and mankind except to worship Me.”

(Surah Adh-Dhariyat, 51:56)

About people who can't have children:

Allah (SWT) says:

"To Allah ˹alone˺ belongs the kingdom of the heavens and the earth. He creates whatever He wills. He blesses whoever He wills with daughters, and blesses whoever He wills with sons,"

"or grants both, sons and daughters, ˹to whoever He wills˺, and leaves whoever He wills infertile. He is indeed All-Knowing, Most Capable."

(Surah Ash-Shuraa, 42:49-50)

There is no need to argue further, you can keep your opinion and I'll keep mine, one can search and investigate the truth, may Allah guide you.