Error establishing a database connection quotas not reached

Hello,

I get this message whenever I try to get to my site: “Error establishing a database connection”.
Everything worked fine until yesterday. I haven’t made a single change since then and yet today my website isn’t working. I also check all of my quotas and I haven’t reached a single one by far. Any idea what’s going on?

Thanks

Likely https://www.000webhost.com/t/rate-limiting-policy/73635