Stuck on building even though ran successfully

@Emerald-cmd You’re attempting to run a server on port 3000.

This isn’t how you work with Netlify.

See this post for more detail:

You’ve not indicated what you’re working with, but if it has a Build command then you should use that instead.

You want to run a build that produces output, and set your Publish directory in Netlify so that the right files are deployed and served for you.