Self-promotion and networking are real important for streamers, but you do not wanna be rude about it, so here's a few tips:
The best way to promote yourself is to let other streamers know that you stream too. Many streamers will shout out fellow streamers they see in chat. (1/4) https://twitter.com/IndieAlpaca/status/1248098164793659393

Here's how to let someone know you stream without being rude about it:
*Raid them! People almost always check out the channels of people who raid them.
*Post when you go live in the APPROPRIATE channel of their Discord (usually an advertising channel) (2/4)

*Bring it up carefully in conversation ("I remember when I played this game, chat said..." "I'm getting ready to go live so I'm just lurking" "I can't seem to get my lighting as good as yours!" that kind of thing).

NEVER ask for a shoutout or a raid for yourself. (3/4)

Most importantly, be nice, engage with chat in other channels, and don't grasp for attention. We're all in this Twitch game together, we can all lift each other up without stepping on each others' heads. (END)