Make sure that the “Orpheus Pro” font is properly loaded on your site. Verify that you’ve included the correct link or @import statement in your CSS and ensure that your CSS syntax is correct. The quotes around the font name should be straight quotes, not curly quotes.

h1, h2, h3, h4, h5, h6, p, a {
    font-family: "Orpheus Pro", sans-serif !important;
}

If the font still isn’t applying, you might need to increase the specificity of your CSS rule.

body h1, body h2, body h3, body h4, body h5, body h6, body p, body a {
    font-family: "Orpheus Pro", sans-serif !important;
}