In a medium saucepan, combine water, mango nectar, sugar, dragonfruit powder, and citric acid. Heat over low heat, whisking continuously until melted.

Remove from heat, cool, and transfer to a large jar.

In a small mason jar, combine barista-style oat milk, strawberry syrup, and soy milk. Froth with a milk frother until it looks pale and whipped.

In a cocktail shaker or large mason jar with ice, combine ½ cup mango dragonfruit refresher base, ½ cup sweetened coconut milk, and 1 tablespoon freeze-dried dragonfruit. Shake well.

Strain into a tall glass over ice. Stir in more freeze-dried dragonfruit if desired. Top with strawberry cold foam and optional sprinkles.