Error establishing a database connection

Hi guys,

I something went wrong and I am not sure what caused it but my site is giving me an error as follows. Error establishing a database connection. Any suggestions how to fix it or how to reset it? It would be nice to not loose all my current themes and content on the database?

Thank you in advance.
Kind regards
Jason Lodder

The page I need help with: [log in to see the link]

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