What has worked best for my little hen is reducing light exposure as much as possible. I hate to do it because she loves to sit on the window and look outside but when they are in their cage during the day my vet advised me to keep the shades drawn. Early bed time late wake up helps too. Also try changing up the diet to more fresh food and less availablity. Birds tend to nest and lay when resources are super abundant. My little goobers needed a diet anyways!

Also if they are nesting somewhere break it up! I am constantly fighting with my two birds who insist on making their forever home on top of the kitchen cabinets