I had the same issue a couple weeks ago. I posted a message earlier on and got some nice feedback. I am getting more eggs now. Below is a list of things I've tried since and I am not sure which one worked. Just for your reference:
1. Extra lighting - I put a lamp with a timer by the quail cage. I am giving them extra two hours of light per day.
2. Food with high protein. - They used to be on layered chicken food with 18% protein. I switched to meat bird food with 20%-22% protein. I cannot find anything higher than this.
3. Time - When I posted my message my birds were around 12 weeks and they are older now.
BTW I have 8 females and 1 male.
Hope this helps.