You can add a Custom HTML block and hyperlink the URLs.

So, instead of simply pasting it (e.g. https://twitter.com/username), hyperlink it like this:

<a href="https://twitter.com/username" target="_blank" rel="noopener noreferrer">Your Twitter Account</a>

This will make it appear as a simple link on the front-end.

If you don’t want the link to open in a new tab, remove both target=... and rel=....

You can also disable embeds completely using a plugin.

I hope this helps!