If you don't have a TRX suspension kit, you can use a rope to do overhead tricep extensions with bodyweight. (ptinto.com)
Try, for instance to replace your bench exercises with dumbbell flyes, or to doing overhead triceps extensions instead of doing pulldowns. (fitnessandpower.com)
Giant - set: Dumbbell Curls 3 sets of 10 - 15 reps (no rest) Triceps Dips (on parallel bars) 3 sets of 10 - 15 reps (no rest) Hammer Curls 3 sets of 10 - 15 reps (no rest) Seated One Arm Overhead Triceps Extensions 3 sets of 10 - 15 reps (90 sec rest) (hugorivera.net)