What allows you to start anew is not waiting, but saying goodbye.
让你重新开始的是告别，而非等待。
使用what主语从句和not...but...结构，强调了主动告别（saying goodbye）对于重新开始（start anew）的决定性作用。
"The sun rises over the sea in the waning night"
"Let go of the past and greet the rising sun with a renewed, tranquil spirit."
"Every moment is both an end and a new beginning."
"Only then is there room for new things to enter our lives."
"Every day is a new beginning. Take a deep breath and start over."