Mainly- action

In the meantime, I'd love to find ways to take more action.

Anyway a good thing for OP to be aware of.Here's the legal definition, it does seem like emailing properties would be a part of a series of events establishing procuring cause but just that action alone would not be enough to establish it: "In the context of a real estate transaction, procuring cause refers to actions that begin or set in motion a serious of events that lead to the final sale of a property.

You might write something that shouldn’t be in there.Most credit reporting services that you screen tenants through have a standard form letter that you can use to send out the required “adverse action notice” if you denied the applicant based on information in their consumer report.

But you may want to research this seller's background, and whether they've been involved in any legal action in the past (either as a plaintiff or as a defendant). 

Is there some other action that others have found to have a good success rate?

I've been taking action in real estate since about June 2014.  

All available siblings would have to participate.Tthis is a process that gives all parties who may have interest in the property to make a claim within a certain time frame, if no claim is made by the missing sibling whoever filed the action will be awarded free and clear title..

Trucks that have the call to action on the back generate more calls as well because people sit there looking at the "sign" (back of the truck) in traffic.I've gotten more people to ask me about my business (e.g., standing in line at a store) when I wear a SHIRT or JACKET with the business name on it.  

If you get no action and you don't want to take the lesser price then pull it off the market and go for #3 then.