Go beyond the ABC's of repentance from dead works etc., on to maturity. Going back to the Levitical sacrifices was dead works which would not cleanse the conscience. Faith would not grow, therefore no fruit of the spirit. The book of Hebrews is a book of ABCs which most Christians do not understand because they do not understand what fruit bearing is all about. The ten commandments is called the ministry of death in 2 Cor.
Many pastors teach that the ten commandments are to be kept.
The closer one thinks they are to keeping them, the more self-righteous that person will be, trusting in their own righteousness instead of receiving the gift of Life which comes by faith. What the writer is saying to the Hebrews is that the blood of bulls and goats system is over. What the Creator once sanctified was done away with and replaced with something much better. A spiritually fruitful life of doing the work of the Father and bearing good fruit could only come from the Messiah. This Scripture has nothing to do with eternal punishment or losing one's salvation.