As you've already paid for the Mazuri kibble- you may want to soak it to get them to eat it- mix the kibbles into canned cranberry sauce or low sugar canned fruit salad. This will soften it up and make it more attractive to eat. But try to remember, birds run a clean engine. Keep them hungry. More food does not make them more healthy. Try and limit their intake and when you feed a management food - small portions. A bird's crop (unless its a ratite or waterfowl) can only fit about five tablespoons of food (tops) at any one time and really- that's too much. Soft Pellets and Crumbles disintegrate in moisture . Consequently, the birds have to consume copious amounts of pellet to feel satiated- and of course there isn't much nutrition (think cheerios) available in that feed.  {But what if my birds look famished?}  _ i hear that a lot ( especially with poultry farmers). So much of this has to do with behavioral enrichment. They are bored and so they eat. They likely have a fat layer on their bodies that would actually protect them from starvation for days. Also, it takes three to five days for the birds to actually digest thoroughly what's being ingested.
Behavioral enrichment- {how can I possibly afford that?} Dry leaves - store as many in contractor bags as humanly possible. Free pumpkins- windblown apples- bury these (after a bit of gouging and cutting so the birds can work at getting into them on their own). This is affordable. Foragecakes are a winner too but they are expensive. One lasts a flock of peafowl for three maybe five weeks- cut them up and hide them -about the aviary- but in a no tip bowl -pre soak a corner- but that's for those that can afford them. Another behavioral enrichment tool is the use of foraging tables. Place old tables ( you can put inexpensive 
walmart no slip plastic table cloth over them)  throughout the aviaries ( especially since dancing season is over about now). Have the kids help by making perimeters "walls " on each table- so nothing can roll off the table. I use firewood, rocks and bricks. Fill with dry leaves or clean straw- don't use hay as it molds- This is now a foraging table. When you put out management foods this is where it goes. And move it from one table to another- every few days. Make sure the management food is difficult to get at. I wrote about the frozen fibre cornucopia. Ceramic planters filled with dollar store cereal and the contents of dollar store bottles of spice mixed up together- these are behavioral enrichment tools- but put clean playground sand or clean potters soil and or leaf litter on top of the food stuffs so the birds have to actually think and use their natural tools to extract what's in that ceramic pot. So this is an example of behavioral enrichment. 
To be clear, it's not about feeding the birds- not to fill them because they are hungry- but rather to encourage them to do as nature intends- search for food- use their brains- cooperate together as a social unit to discover food larders.
  Try and envision a flock of wild peafowl. They'll forage over a wide territory picking up two and half teaspoons of drupes ( think whole peppercorns) three and half tablespoons of leaf buds ( think diced kale moistened in dark red fruit juice_antioxidant rich_ )- four froglets and a dragonfly ( five steamed shrimp in the shell powdered in turmeric)- that's the entire intake of a single bird before the mid-day siesta ( from whenever they've dried off their nocturnal perch and sailed to the ground to the heat of the day when they take rest in a sand pit on the river).
The rest of their day they gorge at a termite nest, some snake eggs a few days from hatching and new leaves from a bamboo grove. That's a huge day naturally and this might only happen twice a week. 
Here's where a high quality kibble comes in handy as it's high in protein, and loaded with micro-nutrients and so on. For those of you that can't find or afford this- look around for a white fish and sweet potato dogfood -use this as a supplement in scratch grain and feed out cooked shrimp in the shell and walnuts, kale, cooked sweet potato as often as you can- but remove soy as soon as you can.