Get going and Kick off

Get going verb - Begin or set in motion.

Kick off and get going are semantically related in come into being topic. In some cases you can use "Kick off" instead a verb phrase "Get going", when it comes to topics like start action. informal substitute

Kick off verb - To take the first step in (a process or course of action).

Get going and kick off are semantically related in start topic. You can use "Get going" instead a verb "Kick off", if it concerns topics such as come into being, start action.