Hi Max,
You can try this tweak:
1 - Download this zip file:
2 - Extract the download zip file
3 - Copy it to fonts folder of template: [your_site_root]/templates/ja_morgan/fonts/
4 - Now you load into template by opening the XML file: root/templates/ja_morgan/etc/assets.xml
Put this line under stylesheets tag:
<file>fonts/font-awesome5/css/all.css</file>
as below:
<stylesheets>
<file>fonts/font-awesome/css/font-awesome.min.css</file>
<file>fonts/font-awesome5/css/all.css</file>
<file>fonts/ionicons/css/ionicons.css</file>
<file>fonts/ptrootui/stylesheet.css</file>
<file>js/owl-carousel/owl.carousel.min.css</file>
</stylesheets>
Now you can use new icons from FontAwesome 5.
Hope this helps.