This website, "economy-simulator.com", has been shut down permanently. Do not believe anyone claiming to be the owner of this website, a former owner of this website, or "floatzel"/"floatzei". They are lying to you. My real Discord account is private, and I would not use any username containing "floatzel".
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Likewise, any site claiming to be a re-opening of economy simulator is lying to you. The source code was released, allowing anybody to make their own version of the website, but this does not mean they are endorsed by or affiliated with the original owner. The intention behind releasing it was so former users could host an instance for a small group of friends, not a public website that anybody could join.
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I do not advise joining any public versions of "economy simulator", especially if they are trying to mislead you by using the "economy simulator" name. 
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If you need to contact the owner of this website, the only method is through email. The email address is: escontact@proton.me