2 land borders are allowed per year. "Unlimited" air entries.
I actually just reread your comment and it sounds like you've only done one land border and probably only spent about 3-4 months in Thailand this year.
I'm no expert but I don't think you'll have any issue crossing into Thailand by bus.
yeah, I think it's only two land border crossings per year. Maybe you'd be okay after the new year but I'm unclear on that. I suspect you wouldn't have any issue if you were to fly in.