@fixwaveub

I would recommend that you install the DigitalOcean monitoring agent, which will help you have an overview of the resources used on your server:
https://www.digitalocean.com/community/tutorials/how-to-install-and-use-the-digitalocean-agent-for-additional-droplet-graphs

Parallax One is a little heavy, but in general it’s the plugins that can consume a lot of memory and it depends on the specific plugin (not the number of plugins). Meaning you can have one plugin, which uses massive amounts of CPU and RAM.

But a wrongly configured MySQL can easily eat all your RAM within a couple of seconds, if a plugin does a huge query.