Your fee is lower than the recommended one, the network is overloaded again and the transaction accelerator is also "beyond limit".
Try from time to time to post your tx id at
https://www.viabtc.com/tools/txaccelerator/ maybe you get lucky at some point.
However, keep in mind that this "acceleration" works only with the blocks mined by ViaBTC.
Or you can ask around the miners, maybe, for an extra fee, somebody will include your transaction.
Edit: I almost forgot.
https://pushtx.btc.com also can help accelerating your transaction. I checked your transaction and it seems that they would charge you 9.30$ for this (credit card), which I think that's extremely expensive.