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Soketi on cloudflare workers should be a nice alternative -> https://soketi.app
Cloudflare workers have a free tier, yes. But I'm not sure how far you can get with that. Otherwise you could use fly.io to deploy and manage it on your own. They have a "we don't bill if it's under 5$" policy.
I'm the Developer Community Manager at Render. I think you might find that our service is just what you need to deploy your project! Here's info on our free tier. Best of luck with your studies!