What does the plain text say?
The plain text of Hebrews 9:12 that I mentioned previously clearly states the sacrifice of Jesus Christ is sufficient.
Read it again “...He entered the Most Holy Place once for all time and secured our redemption forever.”
Does that text suggest that somehow the sacrifice of Christ was not sufficient and did not secure our redemption forever? No! It does not say that Jesus did a lot for us, but it was not enough.