I think the category_id parameter type is the most user-friendly one. Eg:
-- [params]
-- category_id :category
SELECT *
FROM categories
WHERE id = :category
That gives you a category selector box for the input:
Though looking at some of the data you’re trying to pull out, I’m not sure each metric is applicable to filter by category. Monthly Users and Monthly Active Users don’t seem like they fit into that filter.