Before you can go to H1 visa interview at a US consulate, you MUST get I797 H1 approval notice.
It's unlikely you can do F1 visa interview even if you have OPT time left, because you have filed F1-H1 COS.
It's unlikely you can do F1 visa interview even if you have OPT time left, because you have filed F1-H1 COS.