Wanted: Thai Curry Recipe (I tried)

This is what I tried:

• 3 tablespoons red curry paste
• 1 (15 ounce) can coconut milk
• 2 teaspoons fish sauce
• 2 tablespoons brown sugar
• 1⁄3 cup chicken stock
• 1⁄2 red bell pepper
• 1⁄2 onion (a little less)
• Some zucchini
• 2 cloves garlic
• A smaller potato

It is decent, but not great. This is the second time I've tried and the first was really bad. It needs more flavor. I did add a little salt when I sautéed the veggies, which I then poured into the mixture of everything else. I also added a dash of cayenne for a little extra spice. There was very little spice. I have half the batch left, is there anything I can try to improve it?

bon appetit