Preheat oven to 325°F and grease a 9-inch springform pan.
Mix almond flour and melted butter, press into bottom of pan, and bake for 8 minutes.
Blend cottage cheese in a food processor or blender until completely smooth with no lumps remaining, about 2-3 minutes.
Add cream cheese, eggs, sweetener, vanilla, and lemon juice to the blended cottage cheese and mix until fully combined.
Pour mixture over the prepared crust and smooth the top with a spatula.
Bake for 45 minutes until the center is just slightly jiggly, then turn off oven and let cheesecake cool inside with door cracked for 1 hour.
Refrigerate for at least 4 hours or overnight before serving.