The message of Jubilee was that when you live with God your failures couldn’t ruin you for good. A fresh start was always coming. God is a god who flips things around to remake them.
Isaiah even points at it with a word play. Verse 3: a crown (phe-er) instead of ashes (epher, ). Ashes were the sign of mourning. A crown/turban was the sign of festivity.
Jesus came to flip things around. To make it possible to change, and become new!