The other trick as a newcomer to #nostr is to increase the social network distance to the max in the #iris client and set the number of people someone follows to a minimum. Otherwise, one only sees bitcoin people and no discussion on anything else.
I have noticed that I get many more results searching a tag such as #Java or #Scala from https://iris.to when not logged in (using an Incognito mode window) than when logged in, I just get the results of people I follow, which is essentially nearly nobody at this point.
Try it for yourself: https://iris.to/search/%23Scala
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