I feel like most people that are using the term deliberately, are doing so based on reasoning close to Umberto Eco's "Ur-fascism" essay: https://theanarchistlibrary.org/library/umberto-eco-ur-fasci...

If you want something more modern, someone made a tracker: https://www.realtimefascism.com/

The tracker uses "the 14 characteristics of fascism identified by Dr. Lawrence Britt" (which is slightly different): https://osbcontent.s3-eu-west-1.amazonaws.com/PC-00466.pdf