Here is the point of what we are saying: We have a high priest who sits on the right side of God's throne in heaven.
Our high priest serves in the Most Holy Place, the true place of worship that was made by God, not by humans.
Every high priest has the work of offering gifts and sacrifices to God. So our high priest must also offer something to God.
If our high priest were now living on earth, he would not be a priest, because there are already priests here who follow the law by offering gifts to God.
The work they do as priests is only a copy and a shadow of what is in heaven. This is why God warned Moses when he was ready to build the Holy Tent: "Be very careful to make everything by the plan I showed you on the mountain."
But the priestly work that has been given to Jesus is much greater than the work that was given to the other priests. In the same way, the new agreement that Jesus brought from God to his people is much greater than the old one. And the new agreement is based on promises of better things.