you can use "Child-pays-for-parent" if you are either sender/receiver.

otherwise you can use paid transaction accelerator service from:
https://pushtx.btc.com
https://pool.viabtc.com/tools/txaccelerator/
https://pushtx.com/

They charge reasonably high amount like  10%-15% of transaction amount.
I will be rolling out my own paid & "cheap" transaction accelerator service if there are more people who needs this service.