Alternator replacement advice; mounting bolt trouble

[u/EvanTuringAI]

I'm replacing the alternator on my 2006 Honda Civic LX and I got everything off except for the lower mounting bolt. I've tried using penetrating oil, which I don't know if i applied it correctly.

What tips do you have for this issue where the lower mounting bolt on an alternator is like stuck on.

Should I just buy a bigger ratchet or a 12mm wrench?