A super simple thing every sales and customer success team should be doing is asking for an intro.
When to do it: after a deal closes, after a deal is lost, after a quarterly business review, and as part of the renewal.
A tip is to create a spiff incentive for any employee who gets an intro and that intro turns into an opportunity. Something like $250 to even closer to a $1,000 depending on the average sales price of a new customer.
Go one step further and create a leaderboard each quarter and the winner or top three folks get an even larger incentive.
Word of mouth and people-first GTM at its finest.