Just a little heads up, after testing this it seems that you can cheat the progress of the Soul's Journey but after changing statistics it was stuck for my sim at the same position, so wishes, aspirations etc were not filling the bar anymore. So maybe wait until UI cheats have the option to change it, if you still want the Soul's Journey to progress normally
I ran into this same issue today. I found your post and was eager to reset my Sim's Soul's Journey but hesitated when I saw your Sim got stuck and could not make progress anymore. I mentioned the issue to my wife, who is much smarter than me, and she had an additional step to add if you play on PC and use mods. You need the mod MC Command Center.
After using "testingcheats true" and "stats.set_stat rankedStatistic_MovingOn_SoulsJourney 0" (it has to be reset down to 0 if you follow the next steps 100%).
Click on your Sim and open MC Command Center.
MC CAS
Manage Traits
Remove Trait
When you see the box that lets you enter a trait name, enter "trait_movingon". This will bring up all of the "moving on" traits for Soul's Journey. When you click each one, it will remove the trait. Remove them all and your Sim's journey will be reset to 0!
