disk space hosting (urgent)

Hello! Looking for administrator who could help me in the shortest possible time.

I have a VPS hosting on bluhost, there are a couple of sites. Today tried to log in cpanel, got error that disk space is over.

Tried to solve the problem with their support, with absolutely no result.

I need to.could logs onto the server, delete unnecessary folders (this is urgent)
And within a few days to conduct an audit – everything is in order, there are no viruses, optimize, clean, dont know what else in such instances is...)