Help to use a attribute as trigger

I have a sensor for my electricity price for my home. I want to check the price level and if the price is high, I will turn off the heater to my Spa (small swimming pool).

One attribute in the sensor is called “price_level”. If state is_not “very_expencive” on pric level I want the heator to be on.

I have wrote this but it don´t work.

- alias: Spa
  trigger:
    - platform: template
      entity_id: sensor.electricity_price_rydbovagen_16
      value_template: "{{ not is_state('price_level', 'very_expencive') }}" # Heater and pump starts if attribute is_not "very_expencive"

  action:
    service: homeassistant.turn_on
    entity_id: 
         - switch.pump_spabad          # turn on pump and heater

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