In the VAST majority of cases, undergrad students can’t just declare themselves independent for financial aid purposes. In the vast majority of cases, undergrad students will not be given dependency overrides simply because a parent says they won’t pay for college…married, divorced or whatever.
Yes, there are dire cases when an undergrad student is declared independent. Cases of abuse, or incarcRated parents, or abandonment or truthfully being homeless.
None of these were even hinted at by the OP to this thread. None.
So the suggestion to consider becoming independent was not something they even could consider.