Need help losing last 15 to 20 pounds before bulking

I've lost about 50 pounds in 7 months so far but I still need 15 to 20 more pounds lost and maybe 5 inches from the waist before starting my bulking phase. It seems these last pounds are stubborn. Any ideas on how to lose the last 15 to 20 and 5 inches from the waist? Any help is appreciated!