Are you looking to increase the number of referrals you get from employees?
Hold a sourcing party.
A sourcing party is a in-house event where you invite employees to come and scroll through their LinkedIn connections to see if anyone they know would be a good fit for your open roles. Schedule a working lunch and have your team reach out to their network by searching for candidates that match your needs and ask them to contact those folks to see if they are interested.
By educating your non-recruiters how to source you can make a big impact on your employee referral numbers.