The Futura Heavy font is not form Google fonts, is it? You need define the font by css:
1. Please upload the font files(like: otf, woff2, maybe there are other format…) to your web site space by FTP
2. Define the font by CSS @font-face, you can write the css-code into “Appearance > Customize : Additional CSS” or CSS file of child theme, the CSS code is a sample, you can refer your font Doc(if it has).