Get notification when power usage drops

Configuration
10 
alias: Dryer finished
description: ""
trigger:
  - platform: numeric_state
    entity_id: sensor.tasmota_smartplug_2_energy_power
    below: 4
    for:
      minutes: 1 # you may have to increase this time if there are longer pauses in your drying  cycle.
action:
  - device_id: e6919322b2d75551e03f3c932e03361e
    domain: mobile_app
    type: notify
    message: test
    title: test
mode: single

Also try to avoid using device ids.