In your next newsletter announce your new Plastic Free Oceans public page. Include the link and invite people to follow it.
Perhaps include the points in your page under the heading “For the environment we:”
Maybe download the HERO sign and get an image of staff, students or friends holding it up outside your building.
In future newsletters leave the page link as a regular item. This is a long journey and to achieve Plastic Free Oceans we need to keep up the momentum.