Normally I use Beaver Themer to display CPTs, but in this case, I have a site that doesn't use any page builder.
CPT = Announcements (for COVID-19)
CPT ID = 3621
Goal = display CPT in an alert bar on every page of the site
Details = I made an announcement for COVID-19. I plan to display the notice by inserting a simple shortcode in the header.php file. I'm not a PHP coder but I know I can echo a do_shortcode command inside a div in the header.php file.
My issue is I am trying to first confirm that the announcement can be viewed on the site via a metabox shortcode.
Each CPT has the default archive page http://your-site.com/cpt-singular-slug shows the list post of this CPT. On your site is the link https://heartwoodpreserve.com/announcement/
so you can insert the link to the archive CPT page in the header.