Intro Text for Blog

I tried to achieve what I want/need with several options:
– changes in the function (but the text is too long, so this does not work:

function prefix_blog_content() {
    if ( is_home() ) {
		echo '<h2>Welcome to My World!</h2>';
        echo '<ol>
	<li>

– tried to add ‘shortcode page’ on the ‘blog page’

What I need:
– The introduction / Welcome to My World’: stays on top –> achieved with sticky
– Removed ‘introduction category’ within ‘categories’ –> achieved with CSS

What I can not figure out:
– On this post I still have a link to the ‘introduction’ category. How can I remove this?

Grateful for any insights!

The page I need help with: [log in to see the link]