How to stop crossing routes?

I need help on how to stop crossing routes. I’ve been running man defense the majority of the year but now my corners keep getting burned on crossers. It’s usually the TE getting open or the slot receiver. Any advice would be much appreciated.

If you mean drag type crosses they can be tough, I usually choose underneath coverage and sometime I will set the ends to hard flats if my LBers have a hard time getting in front of the route.