Blocktrail's explorer says your transaction contains dust. I tried the viabtc accelerator but it's rejecting it like you say. The 0.00021229 BTC/KB fee is higher than viabtc's minimum required 0.0001BTC/KB. I don't know for sure why it's rejecting your transaction, but it might be because it contains dust.
https://www.blocktrail.com/BTC/tx/d20483e4540ede66acacebfd1a50fca41d7b8749a163f95b2c5aea666429fad3If you are not in a hurry you could wait a long time for it to confirm, or if you want confirmation fast you could contact a bitcointalk user called
Quickseller or another called
macbook-air and offer to pay a small fee for them to get your transaction confirmed.
Both of them have access to the F2Pool mining pool's accelerator, and can get it confirmed in the next block F2Pool mines. Here's a review of QuickSeller's service.
I faced a similar issue a few days back transaction not getting confirmed due to low fee but user "QuickSeller" got my transaction confirmed in minutes when I sent him 0.0001 BTC. He has access to some pool . PM him.