Viabtc's free accelerator service only accepts 10sat/B transactions or higher.
On a side note: it's not "sat/vB" so if it's SegWit, the minimum fee rate may be higher if converted to sat/B.

Your options are either RBF if it's flagged to be replaceable or CPFP the change if it has any. Both incur additional fee but works differently.
The problem is if your wallet supports those options and/or can work out a workaround to manually create such transaction.
So which wallet was it sent from?