It's hard to predict if mempools will get lower today.

I'll try to add it to viabtc's accelerator later (15minutes from now), I'll inform you if they accepted it.

As said above, please read my msg, or at least the sticky: All about "stuck" transactions and what you can do to fix them

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-previous post deleted + update-
Seems like the parent transaction was also unconfirmed and it has a much lower fee rate (25sat/vB),
that's what makes your transaction's fee rate irrelevant, miners are also considering the parent fee when prioritizing your txn.

So, I've requested viabtc to add the parent transaction instead, and it was mined by ViaBTC in block 654649.
Now I've just added your transaction:

Wait until ViaBTC mined a block or two. That's if spider failed to mine a block faster.