Hi karenr! Honestly the biggest lever is starting with a high-quality source at the top of your waterfall. If provider #1 has patchy coverage, you're paying for misses AND paying again when records fall through β that's where costs quietly spiral.
High hit rate at position 1 = fewer records reaching providers 2 and 3. Simple but makes a big difference at scale. Also worth asking, are you enriching everything, or scoring/filtering first? Adding intent signals or basic account scoring before you enrich can cut volume significantly. No point enriching a lead that was never going to convert anyway.
On the governance side, some providers (Lusha for example) give you provider-level controls like credit limits per user, bulk restrictions, usage visibility. Worth checking if yours does, especially once more people touch the workflow.