How Do You Effectively Create an ICP for Your B2B SaaS?

Im in the process of launching campaigns for my B2B SaaS and want to ensure my Ideal Customer Profile (ICP) is spot on. What are the best practices for researching and defining an ICP? Specifically: 1. How do you gather and validate data about potential customers? 2. What tools or methods do you use for market segmentation? 3. Any tips on identifying pain points and tailoring messaging accordingly? I’d love to hear your step-by-step process or insights from experience.