Try pushing it with https://www.antpool.com/user/prioritiseTransaction.htm?m=savePrioritiseTx
It's hard to put that with viabtc's accelerator because fee is low. This is list of different accelerators so you can try it by yourself https://bitcointalk.org/index.php?topic=2510862.0
The size is 20,096 bytes and fees per byte is only 20.024 sat/B. Considering the TX size, the fees per byte shouldn't be that small. I don't know on how long you have to wait on it but I have seen pending and unconfirmed transactions that paid a very low fee and still waiting until now.