Hi there,
And Welcome here,
If I may, Definitely do and take @msfujino’s Excellent suggestion to break it down to basics first, you have a lot of moving parts there, it definitely will make troubleshooting easier.
also I notice you would benefit from having a look at this thread and the code example, You will see the proper pin connection and logic needed to wake up and sleep the nrf52840, some extra stuff as it relates to IMU. The Xiao Grove Expansion Board Video demonstration, w/ code. 🎅
HTH
GL 
PJ 
You’re close you will get it, take a one step at a time approach and edit your post (fix code tags “</>” ) makes it easier to read. 