Thanks @tuanphan for the solution! Here's what worked:
Removed all the CSS above.
Edited site footer and added the following in a code block:
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Barlow:wght@100&display=swap" rel="stylesheet">
3. Went to Design>Custom CSS and added the following:
p {
font-family: 'Barlow', sans-serif;
}