Rival products (burgers, pop songs, political parties) tend to grow more alike over time, because creators copy more successful rivals to replicate their success and steal their customers/audiences.

Paradoxically, this increases the value of being different.

Once you have many people doing something, you have lots of competition and little differentiation. You, generally, never want to be part of a popular trend… So I think trends are often things to avoid. What I prefer over trends is a sense of mission. That you are working on a unique problem that people are not solving elsewhere.