Wordpress - Error establishing a database connection

Whenever I am working on my site (editing pages, uploading photos, etc.), I will get this error after maybe 10-20 min of working on pages, which prevents me from being able to do almost anything on my site. I normally wait for the error to “resolve itself”, but the wait time has been getting longer. I’m not sure what I can do to fix this. I’ve ran Wordpress’ Repair Database feature, but the same thing still happens after doing this test. Any ideas on what I can do?

What the error looks like:

Website: https://techvertex.000webhostapp.com/

Thanks for any help in advance.

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Sadly it’ll be rate limiting, just wait it out or upgrade.

Best to develop locally using XAMPP etc.

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Thanks for the reply.

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