You can try free accelerators such as ViaBtc. I know they have a minimum fee in order for them to accelerate it, which I can't remember now, but you can always try the other services which have varying criteria for accelerating the transaction. ViaBTC also has a max limit of submissions each day which have probably already been used.
Here's a list of all the free and paid accelerators:
https://bitcointalk.org/index.php?topic=2624419.0viaBTC doesnt work we tried using it but it kept on saying submissions are beyond limit even when we submit at 59:59 still doesnt work at all