This is utterly important to me and useful to the entire family of btc users.
This shows how you have already read the OP but not read the replies.
I once wanted to speed up a transaction, I know how it works on ethereum and I thought it was same as it included re-initiating the transaction with the same details but using the same nonce, when I checked on btc options via trust wallet, I didn't find that option there and it became a serious challenge for me. Same happened to my brother also and we had to wait for days before we got it confirmed.
If you do not still want to be frustrated, do not go give those sites that will only keep broadcasting your transaction without accelerating it your txid, also do not pay any coin to those scammers that called themselves accelerators. If your money is collected without not accelerating anything, do not be disappointed.
The only way for now to accelerate freely is ViaBTC. There are other things we have discussed already but which you did not read, go back and read them than for me to be repeating it.