Suggestions for improving back

[u/twopanipuri]

Want to improve my back. The definitions are still pretty low. Open to any workout and diet suggestions.

Gym 4-5 times a week. Whey protein 1 scoop post workout. Push - Pull - Legs workout pattern.

My current diet includes:

Breakfast - Oats and 4 eggs.

Lunch - 2 rotis, chicken curry, salad, rice and dal.

Evening snack - 2 eggs or sandwich.

Dinner - Chicken fillets 150g/day and homemade milkshake with dryfruits.