Any Tips On Cold Calling Home Health Business Owners?

Does anyone have any tips cold calling home health business owners? I've gotten light results doing this as most business owners don't want to sell at all and have dealt with defensive secretaries that makes any excuse that the owner is on vacation, their not in the office, their in a meeting or something. I've had few of the secretaries slam the phone on me and had one write a negative review online about me that's not true. I realized that there's only 150 home health businesses in these database with 7 figures or more in revenue after using the filtering on these sites in the places I'm looking at. I've used d&b hoovers and data axle to source my list. It's unrealistic to outreach and do 3000 calls with this as there not too many business of this I'm looking for even so I got lucky with a few that are interested to sell to me. Anyone has any tips or suggestions? I'm looking in the southwest, midwest( not the great lakes) and a few in the south east(not Florida)

Thanks