Congrats on building something impressive! 🎉
There are a couple of providers I'd point you toward for gaming sites.
First up, there's a company called Jounce that grades publishers and ad sales houses like Publisher Collective. They keep a Bellwether list, which advertisers use to decide where to spend. Publisher Collective isn't on it - that explains the weak ad spend people are reporting here.
For your setup, I'd recommend Playwire or Raptive.
📊 Raptive has stricter acceptance criteria but typically offers the best RPM, so it attracts the biggest sites. With 40% US traffic, you'd likely get in - they prioritise US/UK audiences.
🎮 Playwire started in gaming, which is a plus, though I've noticed them branching into non-gaming sites lately, so their focus might be shifting.
Definitely dig into both. Chat with their sales teams and see who can support you best, especially with GDPR compliance as a UK-based publisher.