Regardless if you are worried about blow-back from a PR perspective, Most non profits spend way less on the actual cause than they claim to, so I'm thinking you'd be able to run a "counter" PR campaign if it really came to that. 

One thing that has worked well for me is spreading my budget over a 5+ touch campaign where I send mail to the same list multiple times to stay top of mind and create some familiarity.

History tells us that as soon as people get out of their holding period, there will be an hyped marketing campaign and then the coins will flood whichever exchange supports trading of them. 

Decided to do a direct mail campaign to a very select group of multi-family property owners (about 90 total).

@David Cianci, from a marketing side: think about thought leadership campaigns, but also knowing how to define a customer base, develop messaging that resonates with this customer's pain points, and offering a clear solution for them.  

For that reason, our cold outreach campaigns target only individually owned properties. 

However, despite having some success, I find myself at a plateau, struggling to grow my list further and enhance its quality.I've employed standard practices such as networking at local real estate events, leveraging social media platforms, and utilizing email marketing campaigns.

2) Probably a stupid question, but is direct mail campaign costs deductible against rental income?

I'm relieved, but surprised Hobbs hasn't pushed on the "giving restriction choices back to local municipalities", as that was a big part of her campaign platform.

So I understand the basics of direct mail campaigns but my problem is knowing what to do when someone actually calls back!