Onboarding Friction for High-Volume PSPs: Any Strategies?

We're a fintech operator seeing significant growth in transaction volume, which is fantastic, but we're starting to hit some serious friction points with our payment service providers, particularly around the initial onboarding and subsequent KYB refreshes for new corridors or higher limits. It feels like every time we need to expand, we're back to square one with document requests, long review cycles, and a general lack of a streamlined process, even with providers we've been with for years. This isn't just about the initial setup; it's impacting our ability to pivot quickly and capitalize on new market opportunities. I'm curious if anyone here has implemented effective strategies, perhaps tech-driven, to mitigate this ongoing onboarding and KYB friction with their PSPs, especially for those operating at scale or across multiple jurisdictions. Are there best practices for pre-empting these requirements or leveraging existing data to accelerate approvals without compromising compliance?