I’ve tried to connect to my server but unable to establish a connection.
Can it be, that the xmpp service doesn’t work with a noho.st domain with dyndns?
Workaround idea: doesn’t have nextcloud have an xmpp service too? I could try to use that one or does that not work either on a noho.st domain with dyndns?
Yes it should work, no reason it shouldn’t …
Why don’t you first explain what you goddamn mean by “unable to establish a connection” instead of talking workarounds already.
What did you try, with what client, what did you expect, what do you get instead, is the diagnosis telling anything in particular, all the usual questions 
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