Prep the pan: Line the bottom of a 9-inch springform pan with parchment.
Lightly grease the sides. Preheat the oven to 325°F (163°C).
Make the shortcake crust: In a bowl, whisk 2 cups almond flour, 2 tablespoons coconut flour, 1 teaspoon baking powder, 1/4 teaspoon salt, and 1/3 cup granulated sweetener. Stir in 6 tablespoons melted butter and 1 teaspoon vanilla until it resembles soft dough.
Press and par-bake: Press crust mixture into the pan in an even layer.
Dock lightly with a fork. Bake 10–12 minutes until edges set and lightly golden. Cool 10 minutes while you make the filling.
Beat the cheesecake base: In a large bowl, beat 24 ounces room-temp cream cheese with 2/3 cup granulated sweetener until smooth and fluffy, about 2 minutes.
Scrape the bowl.
Add the dairy: Beat in 1/2 cup sour cream and 1/3 cup heavy cream until silky. Mix in 1 tablespoon vanilla and optional 1 teaspoon lemon zest plus 1 teaspoon lemon juice.
Add the eggs: Beat in 3 large eggs one at a time on low speed, just until combined. Do not overmix.
Layer with strawberries: Arrange a thin layer of sliced strawberries over the cooled crust.
Pour in the cheesecake batter. Tap the pan gently to release air bubbles.
Bake low and slow: Bake at 325°F (163°C) for 45–55 minutes, until edges are set and the center has a slight wobble. If browning too fast, tent loosely with foil.
Cool gradually: Turn off the oven, crack the door, and let the cheesecake sit inside 30 minutes.
Then move to a rack and cool to room temp.
Chill to set: Cover and refrigerate at least 6 hours, preferably overnight. This helps the texture firm up and the flavors meld.
Make a quick strawberry chia sauce (optional): In a small saucepan, simmer 1 cup chopped strawberries with 1–2 tablespoons sweetener and 1 teaspoon lemon juice for 3–5 minutes. Mash lightly.
Stir in 1–2 teaspoons chia seeds. Cool completely to thicken.
Decorate and serve: Top with more sliced strawberries and spoon over the chia sauce if using. Slice with a hot, clean knife for neat pieces.