Before we could really track down the issue, we’d need to know more about your configuration.
How did you setup your Droplet? Did you use a one-click image from DigitalOcean or did you do all of the configuration yourself (i.e. using a package manager or compiling from source)?
What error(s) are you receiving? You should see output from the error either on the page or in your
How many and what plugins are you using? Using too many plugins can slow your website down by increasing per-page processing of code and database reads/writes. Also, outdated plugins can also cause issues, so making sure all plugins are 100% up to date will at least cover this concern.
Let me know and I’ll see what I can do to help!