Start with your target market
Assess coverage and freshness for the roles and companies you actually need. Test match quality, duplicates, credit consumption, and the impact on a defined sales decision.
Keep data handling deliberate
Verify permitted use, field ownership, retention, and the requirements for contacting people. Finding a record and having an appropriate reason to use it are different questions.
THE PRACTICAL TAKEAWAY
Additional fields should improve a decision, not just make the record longer.