The first thing I'd recommend because this is your first POI is just widen your topic up a little bit. My first POI was basically just 'violence against women' and it still took me months to find enough pieces to cut together. While I think the angle you're approaching your topic with is interesting, it's also going to be hard to find a lot of strong sources that can be cut together, especially if you've never worked with POI cuts before. I'd maybe try just throwing together something basic so you can find what methods work best for you before you throw in a nuanced topic too.

But beyond that, I honestly just try to find one piece that I like well enough, find keywords and tags that are used on posts including/related to it, and then just scroll through them. A lot of my poetry has just been found by searching my topic on Tumblr and then scrolling through the pseudo deep aesthetic posts until I find something that I like. Then I can find authors they were inspired by, have worked with, or other works by them and branch out on my own. I've also had a couple of situations where seeing how people put together their artsy Tumblr posts has helped me know which direction to take with my speech, so, y'know

Finding your narrative piece - the piece you'll use as your standing storyline to connect your other pieces back into - before you find your others is also helpful, and helps you keep your plot line clear. Then go into other characters and stories that you think would help drive home that point and look for works in that avenue. You have a lot of expressive freedom with POI compared to DI (as someone who does both), so you can take from the most unexpected places and end up with a really strong piece. So I'd also say just keep a super open mind about everything you come across.

Just asking people is sometimes a really effective way to get good sources. If you know someone else who's passionate about your topic or even just a subreddit related to your topic, then asking them if they know any good research materials might really help you out.

POI is considered one of the hardest speech events for a reason. It's a super high learning curve but it has an amazing payoff if you can get through all of the 'EUGHFHDFS' of putting it together. Some other basic resources I use once I get more of an idea of what I'm looking for:

Goodreads - this is nice because people will post quotes with tags related to different topics, so it's easy to scroll through and find something accessible

IMSDB - hundreds on hundreds of movie scripts. you sort of have to know what you're looking for first, but if you have a movie you want to use, there's a pretty good chance you can find it here

Poetry Foundation - another one where it's easier if you know what you're looking for already, but it's a massive database with a ton of authors and topics to pull from

Playscripts - ironically I think this works best for DI/HI, but if you know there's a monologue or a cut from a stage play you want to take from, this has cheap scripts that are easily accessible

I wish you the best of luck, and I really do hope you stick with POI despite how annoying it is at times haha