Are there any good websites or anything that you would recommend using to find other poly people? Particularly relating to partners?

The ones I use are OKCupid, which lets you be very open about your nonmonogamy and filter others by their stated preference; and Meetup, which has a lot of poly events in my area.

Other people use certain areas of the personals section on reddit, an app called 3ndr, and FetLife (which is specifically for kinky people, but there’s a huge overlap with the poly community.)