Superworms are bad also. Pretty much everything a pet store does is bad.
Good staple feeders are crickets, dubias roaches, & black soldier fly larvae. Those are the easiest to find. BSFL is aka Phoenix worms/Calciworms/Nutrigrubs. No mealworms. No superworms til he is at least 16in long. Make sure to dust all feeders with calcium & multivitamins. I do mon-fri calcium & sat & sun vitamins. Nothing bigger than the space between his eyes.
He also needs lots of greens at that age. Offer up some collard greens, turnip greens, mustard greens, butternut squash. If you read the care sheets here, they cover all the good & bad foods for Beardies. Kale is not a good staple since it's a high palate & will bind to the calcium prohibiting him to process it.
Also make sure you have a good
UVB light (Reptisun 10.0 or Arcadia 12%) and it needs to be a tube, not coil/compact. If there is plastic over the fixture, remove it. UVB cannot go through plastic or glass. Depending on which you get, you may have to mount it on the inside instead of on top of the screen.
As long as all his setup, lights, temps are good, he may be going into brumation if he is over a year old. Again, the care sheets cover everything you need to know on that. If that's the case, be sure he has a hide to snooze away in & wake him occasionally to try feeding &
hydrating as well as tracking his weight to be sure he's remaining healthy.
I'm not experienced at all, but these are the basic husbandry things I have learned after spending loads of time here, just reading. Hopefully one of the more experienced will chime in and go over your setup & help with what may need improvements.
The care sheets are a must read, even if your beardie isn't going through what is covered at the moment. Good to know what to watch for & expect.
Good luck!