Probably the paint and texture have clogged the orifice as well as the feed tube up. Hope the paint was water based. If so, set the gun down in a bucket of very hot water with the trigger tied open.

It may take several soaks. Each time you check it put the air on and pull the trigger a few times. Eventually it will unclog. By the way, you should take the orifice completely off so there is no restriction.

If it was solvent based you are pretty much out of luck.

Just got one same problem. The trick is to get some lubricating oil take airbrush off from airhose and on the bottom of the airbrush where you connect the hose put some oil then get a toothpick and insert gently and push up you'll feel the trigger go up. You got to do this process a couple of times and also with the air on. It works! Good luck