Keratoconus. C3r. i'm a little confused!

I recently went to eye check up and discovered that I have Keratoconus and even power of - 4 couldn't correct my vision in left eye. The doctor there advised me c3r with corneal Transplant, if I wanted to correct my vision. So, I went to another one, as I got scared a little bit, the other doctor suggested me tprk + kxl for my left eye and said to observe the progression in right eye, as it was not advanced. My parents suggested me another doctor and there I was told that there's no need for c3r and I should wait 3 months to see the progression, as it stops around age 24 in many cases and that my corneal thickness was ok and after three months they'd suggest whether to wear lenses to correct my vision or to go for c3r. I'm a little confused regarding this, can keratoconus still happen after c3r? Should I really wait for 3 months? Isn't it better to get the surgery as soon as possible done? If not how long should I wait to see if there's progression or not. What are the precautions?