For a slipping clutch you can turn down the clutch adj screws, 1/2 turn to start, and then a full turn if needed. If those screw heads are way down in the plate, then time to rebuild the ******.
If your really mean low pedal, then turn in the outside adjustment screw after unlocking the lock nut a 1/2 or full turn, that will make the low band engage fully for takeoff. You adjust the brake band by removing the trans cover and turning the brake band nut on the pedal shaft 1/2 or full turn, be sure to stop at the lock key on the stop washer.
After adjusting the clutch screws, you may have to also re-set the 'free-neutral' if the T creeps too much when the lever is vertical where it should be neutral with minimal creep.