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First and foremost, you would need to contact the closest law of authority like your police or your country's financial authorities dealing with scam cases. The courts in many countries have confirmed in a number of civil cases that crypto assets are "property" in the traditional sense. Therefore, the usual orders allowing you to trace and freeze assets are available.

Then the next thing you need to do if you didn’t do it before reporting the case to the police is to gather all the information you can lay your hands on that could help in tracking your lost funds. You need to do is contacting the trading platform where you lost your money. Not that you will get your funds back for sure, but there is still hope, and you can warn them that you reported to relevant financial authorities.
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First and foremost you would need to contact the closest law of authority like your police or if your country has a special force that deals with scam cases I think that would be a pretty good start.

Then the next thing you need to do, if you didn’t do it before reporting the case to the police is to gather all the information you can lay your hands on that could help in tracking your lost funds.