Does that just replace one kind of infinite debt with another?
I’m seeing that in Hebrews, there very much is more of an understanding of restoration of righteousness involved in the atonement. The Hebraic understanding of atoning sacrifice is meant to restore God’s righteousness, set things right again. And because we screw up so many times, we have multiple needs to seek atonement. It’s not an infinite debt kind of thing, but a continual need for small re-alignments. What makes Jesus so great, the High Priest, is that he can offer one sacrifice, himself, for all of us, for all time, for all of the multiple small and big sins and transgressions of our lives. The righteous order of the universe is cosmically shifted and balanced.
That’s mostly how I understand it… but then there is the passage in chapter 6 that talks about how when we backslide, we crucify Christ yet again… so maybe I’m off on that insight.