Taking Testo and super exited! But scared of loosing my singing voice please help

Hi peeps!! I am taking T very soon, and I am super exited! I am an art and perfomance student and i kinda relay on my singing voice for perfomances!
I sing Alt and I hope that I can have dreamy voice with t , but i am ascared i will loose my high range.

Does anybody have the same issue or knows some techniques??

Thank you so much!