Ask HN: How to productize a freelance consulting business?

I've been working freelance for a few years and found good success in attracting and retaining well-paying professional clients and delivering high-quality work in return. But I'd like to scale this work beyond myself and find out how to generate more revenue on an ongoing basis, without being limited by my weekly working hours. What advice would you give? Do you have ideas for products/services that freelancers can "productize" and scale beyond their own working week?