Ask HN: How can I learn to better command people's attention when speaking?

Talk quietly, and talk less often?

I pay more attention to people who speak less often.

Additionally, I think you might be making the mistake of sharing your experiences in a way that you think makes you relatable, when really unintentionally you may be coming across self-centred. It’s something I used to do all the time, and something I still unintentionally do from time to time. Instead of trying to be relatable by sharing your own experiences, perhaps try and ask people engaging questions that suggest you have had an experience, but don’t explicitly state what it was… like for example, perhaps you visited some tourist destination, that someone else also visited… instead of explaining your whole experience, maybe ask a question like “what did you think of the [insert subject matter] at [tourist destination]?” People like to talk about themselves a lot. I find people like talking to you more when you seem more interested in them, rather than more interested in talking about yourself… if that makes sense?

Try asking questions to engage responses. Let's say someone brings up Thailand in a conversation..

You might say: "Oh, I went to Chang Mai 2 years ago. I went with my buddy and we found this small waterfall while bike riding. It was pretty cool". Something like this is hard to respond to.

Or you might say: "Has anyone been to Chang Mai?" and then engage the conversation from there. You steered the conversation to your interest and now you can see who bites.

I agree with you but the second point is actually good:

"When people would begin to interrupt me, I would continue on with my sentence regardless of them speaking, and I would finish my sentence. I would be prepared to let it get a little awkward if they don’t get the hint at first"

I think this one applies less in a friends setting and maybe more in the workplace but sometimes you have to put your foot down and insist you won't be interrupted.

Yes, but I don't see how that's different. If you have a common interest, and someone says something about this that you have a thought on, which could be of interest to the other people, you still have to wait your turn, you don't just barge in and interrupt.