As I said, I'm talking about "any land thats suitable to be a forest but is not already a forest". These large uninhabited areas in Canada, Alaska and Siberia don't have such land - if any spot there is suitable for trees, then trees already have filled that area for hundreds of years (I mean, these areas already have massive forests), and in the areas where trees aren't growing naturally, it's for a reason, planting won't make a difference.

If you want to convert not-woodland into woodland, then that limits you to farmland or pastures - because there's no such thing as "unused natural potential woodland", any potential woodland that's not used and left alone becomes actual woodland; any potential woodland that's not woodland only became that way when we cut down the trees and cleared the land because we wanted to use it otherwise.