Great advice so far. Just a waiting game till they mature.
Minimum protein is a long known fact, the choke point so to speak for producing eggs assuming the hen is healthy and mature.
The best practice is to have a good commercial laying pellet or crumble available 24/7, the hen will regulate their food consumption to what she needs in 99.999% of the hens.
All that said, there is a place for a small amount of supplement for higher protein, for trace minerals, and vitamins. Now all of that should be present in the commercial feed, but if you can afford it some fresh caught fish or canned sardines, milk, cooked eggs, fresh veggies, will be appreciated, just give in moderation so the birds don't neglect their normal ration. If you are poor like me try catching some trash fish like carp or drum, canning the fish using a pressure canner, and you have some emergency feed for very little cost and effort.