Ah, the OG is back in action!
Look into some of the more solid white labels like brands on Softswiss platform and White Hat Gaming perhaps.
GIG (Rizk/Guts/Metal/Calzone/Wishmaker) used to be super solid, but they seem to have trouble turning a profit, so maybe a hybrid/CPA there.
Ironically, some of the best brands for slots players aren't all that great for affiliates. VideoSlots for example...
Betsson Group is super strong in promotions, but again, unless you can send volumes, they won't necessarily care that much.
Making hundreds of dollars in the always emerging markets.