I assume you lost your freshman year on campus to C19, and this is your first “real” college year. If so, it makes sense that you are just now developing a feel for the campus dynamics and culture.
My vote is to remain on campus. By your own assessment, you’re receiving a great education, have good mentorship, are making connections that will help you post-graduation, and other benefits. Also, it’s hard to overlook a fully-funded education! You haven’t mentioned any negative relationships, treatment, or situations at your current school.
If this is your first year actually on campus, your feelings of being “miserable” are normal for many first-year students. A lot of students struggle with “finding their place and people” their first year away at school. Introverts can sometimes struggle with this more than extroverts.
My suggestion is to give it another semester before deciding to seriously consider transferring. You’ll always be able to transfer to your in-state public, but transferring to a T100 school with a Full-Ride is not usually possible for a majority of students.
Good luck!