First, don’t call it a cult, call it a “club“.

Second, have some sort of charismatic leader.

Third, some sort of physical place of activity or congregation. Some sort of temple.

Fourth, some sort of rituals, lingo, or verbiage.

Some good examples include The Cult of powerlifting, The Cult of coffee, The Cult of yoga, The Cult of Apple (Apple store as the temple), the cult of Leica, the cult of Tesla, the cult of Elon musk, etc.

Also the cult of bitcoin, crypto, cryptocurrency, crypto technology, and Satoshi.

Fight club, the movie fight club is a synopsis on building a cult.