jademind

This plugin adds a simple bar at the top of each of your wordpress pages with a nice call-to-action button. It can be used to promote your products or display some important news for your visitors. You can customize all background and text colors of the bar to your own desires.
Major features are:
<ul>
<li>Simple and clean bar at top of your page.</li>
<li>The bar sticks to the top of your page while scrolling.</li>
<li>Customize bar background and text color.</li>
<li>Customize call-to-action background and text color.</li>
</ul>

Call-To-Action Bar

The 'Call-To-Action Bar' plugin adds a simple bar at the top of your page with a nice call-to-action button.

wpexplained

This plugin allows you to easily add floating social buttons for WhatsApp and Telegram on all pages. It includes:
<ul>
<li>Floating action buttons on desktop and mobile</li>
<li>Sticky top bar with customizable message and links</li>
<li>Customize link, button text, visibility per device, and open target</li>
<li>Detects device and opens the Telegram app automatically</li>
</ul>

Floating Social Channel Buttons

Floating WhatsApp and Telegram buttons with a sticky bar. Boost your channel followers by placing smart social buttons across your WordPress site.

Call-To-Action Bar vs Floating Social Channel Buttons