It wasn't much. Just her reflecting on how she started vtubing at a "young" age (18) and how she's grown since then (she's 21 now). This guy posted a few screenshots, including one that shows the entire chain:
She seems to delete Tweets quite often. Not sure why she deleted the first two messages, but not the third. If she's actually sincere about what she's said here, then good on her, but only time will tell. As
@The Rrat said, her main issue has constantly been not moving on and digging up the past, so she would do well to actually move on.