Focus on diet more at this point. 1lb of added muscle burns an extra 45-50 calories a day, but to get more shred, you must create a net deficeit of fat, so burned is more than stored.
The abdominal improvement, may have helped you get some definition where you wanted it, but unless you crank the eating up to a more controlled and precise level, even if it's good right now, then what you want will be difficult, because unlike someone who is 100 lbs overweight for example and can get results from wholesale change, you're at the stage where little tweaks are desired, for fine tuning of your condition and potentially identifiying exercise based things, that may create little to no additional improvement in the way you wish, will waste your time and potentially cause overtraining, when you overtax your body needlessly, persuing answers to things, that are potentially not based on true wisdom, but merely that of percieved wisdom.
Stick with your current methods and levels of physical exersion and at this point don't increase or change anything, as that may be counterproductive and won't help to isolate the effects of any dietry changes implemented and at this stage isolation of things causal to weightloss is key, to help promote understanding of your future progress, in an accurate way
So what meals do you currently eat and what times do you eat?