1/ even if your current college doesn’t offer a Comp Lit major, you can double major in English and in a foreign language&culture with a literature concentration at many colleges (even if most colleges now focus on cultural aspects such as film and history there’s usually some literature courses), or major/minor or major+2 minors etc. Plan a hefty amount of Literature, Languages, Classics, and History courses throughout Freshman and Sophomore years.
2/ As you said, you’re neither a veteran nor a CC student who attended it due to life circumstances (dropping out of a solid college to attend a CC would go against you.) If you were rejected by Williams, your odds are virtually nil. They’re not going to think “OMG we made a mistake, we should have admitted this applicant last time” but “we turned this applicant down already last year: in the past 6 months they didn’t win a gold medal in any Olympics so, bottom of the pile, let’s look at new applicants.”
In short, your choice really is your current college or your state flagship.
For now, make the best of your current college.
What appeals to you at Williams?
What makes your current college similar enough that you chose it?
When did you start classes and what makes you want to transfer?