I think its all about connections and getting to know people outside they're work. For instance an event - like going to an escape room and getting to know the person and building relationships from there on - the referrals will come by itself. Also, in our organization we have a network of about 1600 business owners and entrepreneurs, we host 12 events a year which members attend and they can bring guests along too , but here we can also put you in touch with the people you really want to meet and make the connections for you.