To learn more and find out what you can do about "stuck transactions" like yours, please read the sticky:
https://bitcointalk.org/index.php?topic=1802212.0It'll help you in future to prevent this situation.
The viabtc pool is a good service as long as you pay a min fee of 10 sats/byte but as they only open the queue for 100 txs every hour, you're unlikely to succeed without trying many times.
Confirmtx has been reported as a scam service. They merely submit your tx ids onwards and then try to claim payment for it. People have been reporting as paying and still not getting it confirmed.
You can instead try Antpool at
https://www.antpool.com/user/prioritiseTransaction.htm?m=Just needs a mobile phone verified to sign up for the free service. Note, extremely low fee txs still seem to take a long time to confirm even after successful submission.