Consider
- using a small calorie deficit
- high protein diet
- insulin control (high PWO, low at other times)
- many small meals, each containing protein.
If u want more help, give us ur stats. I think this is much easier for someone who is newer to bodybuilding or not that muscualr (e.g., me) than for a pro, where aerobic exercise may negatively adapt them to hypertrophy, whereas this isn't really a problem for me (it would just retard further growth in my instance)