#1 I'm assuming you have done this (unless you have starboard)
#2 We need to tighten the screws holding the screw driver as in the photo below:

This lets us squeeze the extra torque needed to keep the screws tight. It needs to be fairly difficult. Then stop! Do it in stages as to not overheat the insert. I prefer not to use any sort of lube to avoid over tightening them and getting the best feel for tightness.
Check for depth, check screw length - strap thickness, clean the hole.
#3 As an absolute last resort, use a larger screw, only if none of the above works.
#4 when enlarged or hurt, I had great success with wall anchors roughened up, epoxied and gently but firmly pressed in. I used a washer below the strap to keep the anchor from riding up as the screw is tightened.
#5 when available, you may use the neighboring hole to add a level of safety by grabbing the corner edge of the strap with a toothed washer.