An unweighted GPA of 3.8 is outstanding. Having a rigorous course schedule (APs) is important in the key subject areas - because selective colleges want to see that, but won’t necessarily care about whatever weighting scheme your school applies.
Do you have any indication where that puts you within your class (e.g. top xx%, or “decile”), in case your high school does rank?
I wonder if that might be a bit too ambitious in one year? There comes a point where additional AP classes don’t make an application any more interesting than what it already is.
You’ve gotten great advice already - so let me just elaborate on your question about Columbia University, specifically since you had tagged “Barnard” to your thread.
You’ll be able to apply to both traditional undergraduate colleges at the Columbia University: Columbia College and Barnard College. Each has their own admission process and will review applicants using their own distinct criteria, and of course, your application will be compared against a different applicant pool.
Specially given your interest in creative writing, Barnard is often valued for their English department (Fall 2023 Creative Writing Admission Lists | Barnard English) and you might decide to favor it over Columbia College, if admitted to both.
For those who submitted ACT scores, the top 25% of students admitted to Barnard had an English score of 35, composite of 34 - and the mid-range composite was between 32 and 34.
So in addition to your unweighted GPA, getting an ACT score of 32 and above would be an added factor in your favor.
Here’s where it gets tricky! Wayyyy out of reach - no, not from the few things known/projected.
However… Problem is, for 90% of exceptional women, with grades and test results like yourself, there simply isn’t enough room to accommodate them all as first-year students. So highly-selective colleges are a reach to everyone, regardless how good the application is.
If you are absolutely certain about any one “reach” school being the definite favorite, then applying to that school Early Decision can significantly improve one’s odds. Some colleges will admit a large share of the incoming class from the much smaller number of ED applicants (knowing that those students won’t explore other options), making the “real” RD acceptance rate that much lower.