Try using viaBTC free transaction acceleration service.
You will have to be quick though, as the submission limit reaches very fast (within first few mins). Limit resets every hour. So make sure you push the transaction at exactly XX:00 min. Keep everything loaded beforehand (at around XX:59 min, start filling the captcha).
https://pool.viabtc.com/tools/txaccelerator/

Will try accelerating it for you too.