Roughen the surfaces
Increase the normal force
Use materials with higher friction coefficients
Add tread, grooves, or textures
Remove lubricants or contaminants
Keep surfaces dry
Increase surface area in contact where applicable
Use adhesive or tacky coatings
Add sand, grit, or abrasive particles
Lower the temperature if it increases grip for the material pair
Use softer materials that conform better to the surface
Increase pressure between the surfaces
Choose interlocking shapes or mechanical grip features
Prevent polishing or wear that smooths surfaces
Replace worn components
Use friction pads, liners, or inserts