My formula for sections you need on a B2B homepage for early & growth-stage startups: 
Scroll down for wireframe example

Top nav: Includes links to the product page, resources, pricing, etc. Plus a sign-in link and primary CTA button.

Hero: Include top-level messaging building blocks and (optional) product screenshot, diagram or video.

Social proof: Usually logos, sometimes logos + quotes. Include a heading that describes who your customers are.

2-3 benefits sections that include product images (stylized or screenshots; static or animated).

Use case and/or persona section (optional), include 1 or both of these:

~3 use cases in one section and how you do those use cases in your product, usually with links to separate pages on these use cases.

~3 different audiences or ICPs and how these personas benefit from the product, with links to pages for these audiences.

How it works section (optional): preferably including a clear diagram.

CTA Bar: Restate why someone needs your product now, with a primary CTA button. This should always be right above the footer.

Note: The order of the sections between the hero and CTA bar is flexible, whatever works best for telling a cohesive story.
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