When it comes to thickening a sauce, there are a few different methods you can use.  One way is to add flour, which will absorb some of the liquid and help thicken the sauce. Another option is to add cornstarch slurry (cornstarch and water), which will also absorb liquid and help thicken the sauce. You can also try adding fruit or vegetable puree in the sauce, which will help give it a thicker consistency. Finally, you can make a roux, which is a mixture of flour and fat that helps to thicken and bind sauces. If your sauce is still too thin, you can try adding tomato paste, which will help to thicken it up.