How do you build a reliable supplier roster when you're selling across multiple categories?

Running a multi-category online store and one of the ongoing issues is that different product categories basically need different suppliers. What works for seasonal decor doesn't work for personal care, and finding domestic wholesalers that cover enough ground to be worth the account setup time is harder than it sounds.

I've been working with a handful of US-based suppliers and Kole Imports has been one of the more useful ones for general merchandise. They carry a wide enough range that I can consolidate orders across a few categories at once rather than placing 4 separate small orders from 4 different vendors. That alone cuts down on admin time by a lot.

Still, my supplier list feels scattered and I'm probably duplicating effort in some areas. For those running established multi-category stores, do you prioritize breadth with fewer vendors, or go narrow and deep with more specialized ones? Is there a practical threshold where consolidating suppliers actually moves the needle on efficiency?