Prediction Market Investors – Where Do I Find Them?

I'm building a great product with a few dozen early users. The niche I'm starting with is betting on auction results, since I'm deeply embedded in the broader automotive, art, watch, and other communities, both in person and online. I know how to build a great product from this niche and have proven to find early PMF among the initial adopters. However, where does one find investors for an idea like this? I believe PolyBets.fun can be bigger than Kalshi in a shorter period of time by focusing on these niches that people follow religiously day to day. Whether they can or can't afford them, they watch these markets to gain insight into their personal portfolio strategies.

I don't want to apply to YC again. I applied 7 times, with and without co-founders, with and without referrals, and with multiple different ideas. I'm YC'd out, so now I'm just looking for people who believe in the product, the founder (me), and the vertical. We're looking for a large number, primarily to get past all the regulatory hurdles (CFTC DCM), which require a good amount to get started with.