In case you don't know, there's a lot of transaction acceleration services here, most of them were free to charge, try it.
already "tried" most of them, none work
At this point with the size of the mempool, the transaction accelerations provided by both the members of the community here taking requests manually and the automated transaction accelerators such as ViaBTC's found online are not going to cut it when competing against people paying much higher transaction fees. I have used both and they were both effective
during periods of low network activity. The current recommended fee now, however, is around 250 satoshi/byte, which is a much higher priority than the transactions put through accelerators. You are not going to be able to get your transaction through without either having a very high transaction fee or by paying a transaction accelerator a significant amount of money to cover for the lack of such fee. There is no way around it; best you can do is wait or pay if it is urgent.