My baby did this too. He started out on crickets then month later he only ate meal worms and occasionally calcium worms and some greens. I stopped the meal worms cause he was WAY too addicted and just offered him calcium worms and kept trying with crickets. It took him a bit but he loves his crickets again and I only feed him his meal worms as a treat now.
I would stop with the meal worms and try calcium or butter worms which are better for your beardie. I also think you should keep offering him crickets and I bet he will turn around, just give him time. The roaches are a good idea too, I was recommended to those buy them also. Hope he starts lovein those crickets again soon :mrgreen: