Actually both of your other posts have received replies. Who advised you that you need to change your 2014 filing status? That part is pretty mystifying.
It is not clear what your 2014 situation was, nor is it clear what your situation was for 2019. Provide some details so you can get a better answer.
You say you are supporting a college student who is 24---but you do not say how much income she herself had for 2019--that is important if she was 24 at the end of 2019.