theming – How to render a custom block in a twig file?

I created a custom block named “Alert Bar” in the “navigation” region and I want to render it in my header file.

My header file currently has code like this to render the blocks –

{% if page.navigation or page.navigation_collapsible %}
  {% block navbar %}
    {% if no_head != 'true' %}
      {% include '@eventsns/components/navbar.html.twig' with incs %}
    {% endif %}
  {% endblock %}

Can I do something like {% block alertbar %} to display the alert bar block? The machine name says it is “alertbar” but I’m not sure if that’s the correct variable since it does not render anything.