Hi,
To be thorough, I’ve ran your site through 3 different web page test sites.
Results found here:
https://webpagetest.org/result/201115_DiT8_efe655c5e9857fbc19cab08d4bfd40ac/
https://gtmetrix.com/reports/www.nickkembel.com/txJuBWyE
https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.nickkembel.com%2F&tab=mobile
You’ll notice some similarities on what they recommend.
Most of them can be addressed by using plugins that minify, merge into one file and cache your stylesheets and scripts. Examples of plugin/s that do this are Autoptimize, SG Optimize(if you’re on siteground), w3 total cache, WP Rocket and many more.
You should also try to reduce requests from external sources if possible. If you can host your fonts and icons locally instead of requesting from Google and FontAwesome servers, it should improve your site’s score as well.