If you are human then concealing sin is probably your preferred option. Failing that you might try to diminish them by comparing them to sins that are, in your opinion, much, much worse.
The blood of Christ does not cover your sins, conceal your sins, postpone your sins or diminish your sins. It takes away your sins, once and for all time.
But you can't do either of those.
A final option is simply to ignore your sin, simply postpone dealing with it.
But God sees, and God has chosen to act on our behalf.
Perhaps we are overly familiar with forgiveness to remember the awesome nature of what God has done for us. It's good to be reminded that we stand forgiven at a high price. In these days of super discounts and cash-back offers, The price for our forgiveness remains out of reach, too high for you or I to pay ourselves.
That God steps into our history to do for us what we cannot do for ourselves is still the amazing message of Advent.