Automating Lead Generation in M&A for Healthcare: Tips and Tools

I work part time for a Mergers and Acquisitions company that focuses on the healthcare sector. The role is 100% commission, hence only being part time. I am trying to find ways of automating my role so I can be more effective at identifying and contacting business owners and getting them on a call to see if they are interested in listing their company. There are several tools I already use, and I've messed around a bit with Clay, by importing new contacts that I add to our company Hubspot, but I want to take it much further. The most time-consuming part of all of this is finding business leads, then enriching them. If I could create something in Clay that reliablly did 90-95% of that work, it would be huge. Has anyone else found a reliable way of sourcing leads, checking them for existing Hubspot records (don't want to create a duplicate), creating a new business record in Hubspot, and then enriching it by identifying the owner(s) and finding their direct contact details (email and cell phone)? The biggest part for me is making sure I don't create duplicates, and I can have something finding new leads for me on autopilot, so all I have to do is reach out