Hello and welcome @Bryan_Spann 
Using the safe mode options ([YourSite]/safe-mode) can help you pinpoint where the issue may be coming from. Also inspecting the console for errors when you try and load the site can also be quite revealing (right click, Inspect, then look at the Console tab when you refresh your page). Your /logs can often have some good information in too. 
When you install a plugin and perform a ./launcher rebuild app this will also update your site to the latest version, which (if it’s not the plugin itself) can sometimes cause conflicts with any existing custom code you may have in place. Using the methods above can often help you track down exactly what is causing the issue and allow you to turn it off or tweak it as needed.