I had one of my transaction stuck for quite long time. I tried some free bitcoin accelerators but it had no impact on the speed the transaction. Later the transaction got confirmed on its own. So I feel that these free BTC accelerators are just marketing gimmick to sell their paid options or to drive traffic on their sites. Do you agree with this ?
Sometimes confirmation on the mempool takes time before the confirmation complete maybe as at the time you did your transaction, there were many transactions ahead of you that needs to be attended to before yours. Sometimes if you use low transaction lower than 20sats /byte it might take longer even with free accelerator tools. If you have used the medium transaction fee, it would have gone earlier because minners would place you transaction above others.