This link is for an RBF double spending guide, and other options for fixing stuck transactions.
https://bitcointalk.org/index.php?topic=1802212.0This link is to a thread with software for RBF double spending. If you read the whole thread it explains how to use it, and workarounds for a few bugs. However, it requires some technical skill to use.
https://bitcointalk.org/index.php?topic=1506632.0If you keep trying the ViaBTC accelerator it will eventually accept your transaction. It only accepts 100 transactions an hour, so you have to keep on trying.