At this point, it seems you haven’t even looked at the options for summer or online. Btw, that includes a summer college course.
You’re too worried about it being listed as French 10. Adcoms look at the transcript and will see the grades, but also count the years. You do not have to take the French subject test. You don’t need tl prove any proficiency. You need good grades and the right courses/count.
Make sure you know what the more competitive colleges on your list look for. It’s not unilateral. If you dig into their websites- and look at the Common App- you’ll learn much.
Now, learn what your options really are. We can’t explain any better that you need to do something.
AP French is a super-honors version but “final level” at the end of an advanced sequence - you need to reach level 4 before you can take it.
So, Academic (U/M) are the only levels allowed in your case.
(‘College’ doesn’t count for US 4-year universities).
It doesn’t matter when you take it but it has to cover a full year of French.
Look into French immersion programs in Gatineau or Montreal.
If that grade 9 French course assumes French knowledge that you learned from grades 4-8, that probably means that it is more advanced than a beginner (level 1) course in French in a US high school, but it is not necessarily obvious what level of US high school French it is equivalent to.
You may want to check how well you know French in terms of US high school standards by looking at the French SAT subject and AP test sample questions.
However, even if your French knowledge is high level by US high school standards, you still need to figure out if US universities will understand that your grade 9 French course is at the high level instead of being equivalent to a beginner course in French in a US high school. Possibly, this may mean taking the SAT subject and AP tests in French, since these are well understood by US universities.