can i get unbanned after 1 year

Sure, so long as your ban was a 14 day ban.

If it was a precautionary suspension maybe because of prolonged inactivity sure.

If it was a permanent ban then it's unlikely. Those are rarely overturned, and if It's been a year already its going to unfortunately stick.

Permanent ban is, as the name suggests permanent. It isn't lifted over time, it is never lifted unless it was a false positive ban.