Ok, I need help

[tom_l]

Firstly please format your post correctly: https://community.home-assistant.io/t/how-to-help-us-help-you-or-how-to-ask-a-good-question/114371#oneone-format-it-properly-16

Create a second automation to dim your light using a time trigger:

Automation Trigger

In the actions use the light.turn_on service to dim the lights to 50%.

Light

Putting all that together:

trigger:
  - platform: time
    at: "21:00:00"
action:
  - service: light.turn_on
    target:
      entity_id: light.sunset_lights_on
    data:
      brightness_pct: 50