I have enjoyed reading the stories on this web site:

• https://www.starterstory.com

He recommends this site, where they share financials:

• https://www.indiehackers.com/businesses

This one is called Startup Success Stories, from Entrepreneur magazine:

• https://www.entrepreneur.com/topic/startup-success-stories

Here is a YouTube channel with over 100,000 subscribers:

• Startup Stories
• StartupStories.in