In view of your figure, you have to tie some weights to your forearm to exercise your biceps. E.g. using a clamping belt.

In addition, the grip in front of the fist (that is, the side grip you said) also exercises the biceps brachii, but the biceps brachii is practiced more than the palm-up posture.

The diet is ok. Pay attention to the meat in lunch, and don't be 7-8 minutes full. I don't like to accumulate fat for breakfast. You can eat meat for breakfast. There is basically no problem in controlling weight loss at dinner.