<p>^
I’m not the OP but I think you should stay for senior year. A lot of application deadlines have already passed and you’re going to have fewer choices for where you can go. Staying during senior year would allow you to improve your test scores, extracurriculars, and essays.
I recommend taking dual-enrollment classes at a local college during your senior year. My high school doesn’t offer much either, so I finished all my graduation requirements junior year so I could do this. Where I live, dual-enrollment is free, so I save money on college too.</p>