It sounds like you are asking, what is pushing time forward? That's what time is doing, it's moving forward and we go with it. It can be slowed down or sped up and we would still be moving with it but in a different frame of time. So far we know that mass and velocity can manipulate the passage of time, so it wouldn't be a leap to say that mass and velocity could be the driving forces of time.
Jimmy_jab_masoneilan t1_j1w9e2j wrote
Reply to ELI5: If time is the fourth dimension, then what force is pushing us through it? by quacduck
It sounds like you are asking, what is pushing time forward? That's what time is doing, it's moving forward and we go with it. It can be slowed down or sped up and we would still be moving with it but in a different frame of time. So far we know that mass and velocity can manipulate the passage of time, so it wouldn't be a leap to say that mass and velocity could be the driving forces of time.