Hi and welcome
I think it would help to know what your current flock size is and what you feed them. As others have said, cutting the nutritional intake of your flock, if they are layers, will impact on their health and egg laying.....layers need to have free access to a formulated feed...they won't eat more than they need to. If you feed scratch or whole grains you could cut that out and just give them the formulated feed which is designed to provide everything they need to produce eggs. Feeding too much scratch just results in fat hens and quite often associated health problems as with any animal with excess fat deposits. I recently culled some of my neighbours hens that were not very productive and was horrified at the amount of fat inside them encasing all their organs and belly....it was literally inches thick....no wonder they were not laying well. Interestingly I kept one and integrated her into my flock and she is laying much better now that she is on a mostly layer pellet diet. Previously she had been getting about 1/3 of her daily ration as scratch plus occasional fat trimmings off ham etc.
Cutting down on waste can make a significant difference...pellets are better than mash for that, as hens will bill food out to find the bits they prefer in a mash and waste the rest whereas the pellets are all the same so it all gets eaten. Also some feeders are better at preventing spillage...but buying a new feeder will cost money of course, so may not be worthwhile.
Some people find fermenting feed reduces the amount the hens eat but I would guess this is negligible unless you have a large flock.
Free ranging in the non winter seasons can help but comes with risks. There is very little benefit to free range in the winter... not much to forage on and more risks...hungry predators looking for an easy meal, less cover from over head predators etc.
Ensuring that rodents cannot access feeders at night can make a big difference. I have hanging feeders but recently have found that rats are still managing to access them and I've started to bring them out overnight and put them in a rodent proof bin and hang them back up in the morning.
Culling non producing hens and roosters from the flock will of course make it more economical and just generally downsizing as others have suggested.
Farming mealworms may help a little.
I would not recommend buying feed in bulk as the nutrients, particularly the vitamins will start to break down over a few months and weevils and other pests can get into it and spoil it....not worth the risk
That's all I can think of off the top of my head.
Regards
Barbara