Respawn my Roll A Ball Tutorial

Hello, I am trying to edit the roll a ball tutorial and I currently did’t want any walls to protect the outside of the ground(platform) and I was wondering if there was a way that once the ball falls off the platform that there was a way to reset the ball to the starting point of the platform? I also have a timer set up in my game and I would like the timer to MINUS 10 seconds once the ball falls off the platform

here is my script for the countdown timer!

and then here is my playercontroller that looks like this

all I want is to be able to reset my playercontroller (ball) to the original point while also having the ability to subtract time from the timer.

Any Ideas would be greatly appreciated! Thank you!

Just put trigger collider under stage, or check y position of your ball