If your crockpot beef stew turned out too thick, you can try thinning it out by adding more liquid such as beef broth, water, or even tomato juice. Start by adding a small amount at a time, stirring well, and then adjusting the consistency to your preference. Additionally, if the stew is too thick due to overcooked vegetables releasing starch, you can remove some of the vegetables and blend them with a bit of broth or water before adding them back to the stew.