Place the chilled cooked shrimp in a glass bowl, add the lime juice, and stir so every piece is coated.
Cover and refrigerate for 15 to 20 minutes, stirring once halfway through, to let the lime flavor the shrimp.
Drain about half of the lime juice from the shrimp, then add the diced tomato, red onion, jalapeño, cilantro, and salt. Stir gently to combine.
Right before serving, gently fold in the diced avocado to prevent browning.
Spoon the ceviche mixture into individual tortilla chip scoops or wonton cups and serve immediately.