from my experiences of oshis that graduated prematurely vs those that haven't, it's having "goals" on their list that seem like a pipedream instead of something realistic that can be achieved in a year or 2. Don't fall for scams pretty much.
for ex.
>oshi that graduated before a year put this on their debut
travel all over the world!! Play a game with CEO!! Get 10 million subs!!
vs
>oshi that stayed around for more than 4 years and counting
do my 3D debut! take vocal lessons! improve my (insert current talent they have)!