Only thing I can think of at the moment to attempt to have this transaction confirmed is to use a service like VIA BTC transaction accelerator to get it done within the next block. Went ahead and tried to do it but I guess they're at their limit at the moment so you should attempt to run the TX (4756d52f3ff88552a404f31c1f1bf8841dca21f77eb6556804812c3d6adbffbe) through the website.

Here's the site by the way, it's a pretty nice tool when you accidentally didn't set the fee high enough - https://www.viabtc.com/tools/txaccelerator/

there are way more unconfirmed transactions in the mempool than usually. This causes a backlog, so i guess a lot of transaction will have to wait a bit longer for a confirmation.

this transaction has a fee of 11220 satoshi's and a size of 373 bytes. So it has a fee of 30 satoshi's per byte.
https://bitcoinfees.21.co/ recommands 70 satoshi's per byte for a fast confirmation at this moment.

30 satoshi's per byte will have a 90% chance of getting into a block in less than 900 minutes.

Good luck!