I've been working in a hotel for almost a year, but I only paid social security and didn't sign a labor contract. What happened? Can the hotel sign it for us? The contract is valid.

You can go to labor arbitration to ask for double wages and compensation (over one year 1 month, less than one and a half months, you can add up), and you can go to labor inspection to complain about social security problems. If you need to provide work clothes, work permits, work tags, pay card punching records and other evidence to prove that you work in a hotel, you can go to arbitration.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.