My feed is often full of nothing but low quality spam from a single user - "bOt@zerobytes.monster" . It's obviously a bot, and it's ruining my experience. I know you can typically ban individual users from your feed on Connect, but its not working for this account. Can anyone help?

After blocking is it still visible on the webinterface?

And usernames need an @ before them to distinguish them from an email address.

@bOt@zerobytes.monster

I don't know about connect, but you can block an account in your settings in the web UI easily enough. That should then also be blocked whenever using whatever app.
Just hit the block button from that user profile.

Also, you can check the currently blocked accounts here:
https://sh.itjust.works/settings
(Click the blocks tab)
You can add add users from there, although I usually do it from their profile page.

You can absolutely block individual users on connect. On one of the bot's posts, hit the ellipses and select: block >block user