How do i improve my running for football?

ok this past season i was quarterback and for my senior season i want to run for more touchdown last year i only had 3 ive been working on my running since november when are season ended with interception 2 seconds left spiked it threw it for a hail merry interception ran back for a touchdown my time so far to run the thing of the field is 12 second but coach want back in 4th for 8 seconds but how do improve thanks