How do you test if people understand your new product instantly

Hi everyone,
I have been building a simple link in bio tool on the side, and I cannot tell if new visitors understand the idea clearly enough.
As the builder, it always feels obvious to me, which usually means it is not obvious at all.
I want to learn from people who have done this before.
My questions are simple:
• How do you test first impressions?
• What signals show that the idea is clear
• Do you run quick user tests or something else
• What mistakes should I avoid early on
For context, the tool I am working on is boringone.page. It creates a clean one page profile from your links in a few minutes.
The focus of this thread is the process, not the tool.
I would love to hear how you approach clarity and simplicity in your own products.
Happy to share feedback with others, too.
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