Me personally I wont be setting a 1sat/vb transaction anytime soon. Maybe ever. Those extra sats/vb I pay extra hopefully will save me time and headaches.
If you set the fee rate to 8 sat/vbyte, your transaction would be less than 1 vMB from the tip and will be probably confirmed soon.
Note that the required fee is dynamic and it can change over time. If I were in a hurry, I would set the fee rate to 12-14 sat/vbyte.
I find those accelerators pretty fishy.
Viabtc worked for years, but only if you pay at least 10 sat/byte. And by the time that's needed, you won't be the only one so it's hard to get into their queue. All the other "free accelerators" are useless.
I also confirm that
ViaBTC free accelerator works well.