There are three main ways:

First, build a professional security team (2-6 people). You can hire veterans or retired special forces personnel to exercise openly in a small area, so that hooligans dare not make trouble. If you meet someone who has smashed the venue, you just need to control its arrogance and not hurt people. It is better to send it to the police station.

Second, install a camera and use video as legal evidence. Cameras may not be effective, but slogans can generally shock people. For example, after installing the camera, post slogans such as "monitoring range" or "24-hour monitoring".

Third, get on well with the local police station. They only need to send out 1 or twice, and let the gangsters clearly realize that the owner of the skating rink is not easy to mess with through training and other means.

Finally: don't overdo it anyway, it will easily cause adverse effects. A strong dragon won't crush a local snake.

If you have enough money, you should open a real skating rink in a higher place, so those gangsters can't step in, because you can be managed by security guards in big shopping malls.