Exploring Additional Enrichment Methods for Finding Contacts at Companies

Hey, I have a list of companies (From Ocean.io) and the typical enrichments for Find People at company haven't given me much. What other methods or enrichments can I make use of here? I used

What other options do I have in Clay? Those 3 above only returned data for less than half of the list PS - I tried Datagma but the integration doesn't seem to work, I get an error for each row with no explanation