The only thing left to do is wait patiently, on a side note I was able to submit it to the Antpool too:
I don't think the Antpool accelerator has been functional for months (years?) now... It will happily list your transaction in the "Accelerated Transactions" column after you submit it, but the transaction never seems to get included in Antpool blocks. 
pushtx.btc.com is an alternative and they might be cheaper.
Unfortunately, this also seems to be defunct... I'm getting a blank page on that one. Sadly for the OP, the mempool has ballooned back out to over 55k transactions again... it's going to be a long wait.