What are the most in-demand services, besides marketing, that startups need and are actively seeking? [ I will not promote]

Many startups pour resources into marketing, but what about the other essential aspects of their business? What are the biggest pain points for startups outside of marketing, and what services address those needs effectively? I'm trying to understand the current landscape of startup needs beyond marketing and where the biggest opportunities lie for service providers who want to pitch their services to startups. Any insights from those who work with or at startups would be greatly appreciated.