Hormone therapy does increase risk of cancer, but puberty blockers do not as far as I’m aware. Kids take puberty blockers for many reasons, only one of which is to hold off on a gender decision. They are also used to pause early puberty or to prevent puberty when puberty would come with other adverse medical problems.

And the increase risk of suicide is worse if no choice is given to transgender youth. Most of the suicidal ideation is attributed to the intolerance and hate transgender people experience, which leads to mental health issues, substance abuse, self hate, etc. The issue therefore is not being transgender, but with societies lack of acceptance, which you are presently participating in.