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People attending responding yes to LI event works wonders coz it sends a notification to their connections of them attending them event. Ads have generally not worked for us too.

Try influencers. Works well in certain cases. Of course, depends on industry and other factors

In the same boat right now (for B2B Services). One thing I am trying to reach out to all the customers (current as well as ex), opportunities and leads/people who dropped inquiries via Email. I feel this could be a great touchpoint and not 'just another follow-up'. Another thing could be to leverage founders' LinkedIn connections as well & sending invites to their connections.