I'm not sure what all you're running but here's what's worked for me.
Start by picking up ICPs and running dedicated campaigns for each ICP. Here's the ad types -
1. Document ads. Case study, ebooks, etc - customized for the ICP
2. Use case ads. Single banner, carousel, video, etc. How can ICP benefit from your product
3. Event ads. Host monthly webinars - could be a thought leadership or a product demo webinar and run ads to get people to register