talk(1) is fine to discuss with another user on your system, but if you want to broadcast a message to every tty, something always working is:
echo 'hi every1 im new!!!!!!! *holds up spork* my name is katy but u can call me t3h PeNgU1N oF d00m!!!!!!!!' | wall
Broadcast message from katy@supersecretviphackerbox (pts/1) (Fri Apr 24 07:56:31 2020):
hi every1 im new!!!!!!! *holds up spork* my name is katy but u can call me t3h
PeNgU1N oF d00m!!!!!!!!