The mempool is congested these past few days, so your transaction with a 100 sat/byte most likely got ignored since the higher fee's are prioritized. Looking at the mempool now, Its stabilizing and if it continues to, your transaction will likely get confirmed in the next day or even less. You can see it here:
https://jochen-hoenicke.de/queue/#2hOn the other hand you can try viabtc's transaction accelerator. The free service didn't work these past few days but I think they just undergone some changes so it might work???. Enter your TXID at exactly XX:00:00
They also have a paid service although only BCH is accepted:
https://pool.viabtc.com/tools/txacceleratorEDIT: I added your transaction in their queue, Expect a confirmation in the next few hours