I came across several people now on social media platforms who have in most cases a BIG following and promote their so called brokers. Often the broker site (belongs to the social media guy who ‘claims’ to be a forex/crypto trader?) has no site traffic & the domain is very recently registered!
Also, look for contact details and addresses, such as on a contact form. Send a message to their support and see if they reply. Google Search the address as well, and use Streetview to have a look at the actual office. It’s often a red flag to see a business registered at a home residence or some strange commercial district.