I've just done the same thing, sent a large transaction from an old multibit wallet and forgot all about the fees being set too low, don't think I could of edited them anyway.

TXID:      99ab93267912edab9712ee6b7b5b6f97aa9c4c9fe531c73a411c24bd030ae187

Anyone got an idea of how long that will take?  I added it to antpool and viabtc tx accelerators.    Is this likely that I'm going to have to use btc.com accelerator to get this transaction through, don't want it to be stuck August 1st

Any advice would be greatly appreciated