[swim|go] against the (tide|stream)

to do or think the exact opposite of what most people are doing or thinking

The idiom "go against the tide" comes from sailing terms. When sailing, the tide refers to the movement of the water caused by the moon and sun. Going against the tide means sailing in the opposite direction of the water's flow. This idiom can be invoked when discussing individuals who hold unconventional beliefs, pursue alternative approaches, or make choices that are different from the mainstream.

Despite widespread criticism, she chose to swim against the tide and pursue her unconventional artistic style.
In a world driven by materialism, he decided to swim against the tide and prioritize experiences over possessions.
The political activist was known for his courage to swim against the tide and challenge the established norms.
The young entrepreneur's decision to go against the tide and start a business in a declining industry proved to be a wise move.
The scientist's groundbreaking research went against the tide of prevailing scientific theories at the time.