This whole schizo theory that Amelia was burnt out from streaming is such horseshit. If you actually listened to her official announcement, she clearly said it wasn't due to private reasons. Also the way she was on a verge of tears when she announced her "soft graduation", meaning she still was emotionally tied to the streaming.
Most people actually don't know but when Coco graduated, she was practically just waiting to leave Hololive, she didn't like streaming for hololive, though other hololive jp members were heartbroken by her decision obviously. Sana practically failed to attract an audience to her streams and her back problems caused her long hiatuses so she knew she wasn't going to make it. Amelia on the other hand though, has a different reaction.