Thanks so much! I was thinking of increasing ingredients by 1/2. But 1/4 might be better.

Great question! For a 10-inch crust, increase the recipe by 1.25x. A 10-inch pie has about 25% more volume than a 9-inch, so this keeps your proportions right.
Here’s what that looks like:

10 ounces cream cheese (1¼ blocks)
⅔ cup powdered sugar
1¼ teaspoons vanilla
5 tablespoons sour cream
⅔ cup heavy cream
1¼ cans cherry pie filling

If those fractional measurements feel fussy, you can round up slightly (like a full ⅔ cup powdered sugar instead of calculating exactly). A no-bake pie like this has some wiggle room, and a slightly thicker filling won’t hurt anything. I hope that helps. Happy Thanksgiving.