Droplet regularly but intermittently returning timeout and 'error establishing database connection' errors

I have a simple Wordpress install on my droplet, and yet my website is so far pretty much unusable thanks to the regular (every few minutes or so) drop outs in service.

I don’t know how to approach this problem, as I don’t understand any of the solutions that come up if I search it. Are there any easy fixes to this? (clearly the site setup is working as I can connect to it. It just returns these errors regularly even when making no changes).

I admit I took on too much by deciding to use DigitalOcean for my site, but I didn’t expect it to be this unreliable, as I’ve set up Wordpress installs many times in the past. If it’s not easy to fix then I guess I’ll have to move elsewhere. Again.

https://lewisheriz.com/