For meringue that won’t fall flat, add ½ cup of miniature marshmallows to the meringue just before spreading. The marshmallows add body to the meringue and help it keep its height.
Links
[1] https://www.yummymummyclub.ca/food
[2] https://www.yummymummyclub.ca/food/sweet-stuff
[3] https://www.yummymummyclub.ca/tags/meringue
[4] https://www.yummymummyclub.ca/tags/marshmallows
[5] https://www.yummymummyclub.ca/tags/add-marshmallows-to-meringue