Try to push your transaction through those services. User HumbertDice on the forum is apparently also offering this service for free via Antpool, and some users are reporting that their low fee transactions were confirmed: https://bitcointalk.org/index.php?topic=2111723.0
Just FYI, ViaBTC accelerator doesn't accept transactions with a fee lower than 10 satoshis/byte, and he probably can't use the paid accelerator from BTC.com because they only accept payments with Alipay.