There are a few things I am particularly proud of doing. One is moving to an Extended Validation certificate that encrypts our entire web site. When I did this 2½ years ago, pretty much none of the big wildlife conservation orgs had certificates on their main website content. (Of course they all did on their Donate page.) Even today, there are way more sites than I would expect that still are running unencrypted. In fact we are the only one of the Charity Navigator Perfect 100 animal charities to be fully encrypted.
The Extended Validation is a nice touch; it guarantees we are the non-profit organization that we say we are. It costs a couple hundred dollars per year, so probably not in the budget for a lot of smaller orgs. But that's not as important as simply having a basic security certificate. These days there is no reason not to have one. Let’s Encrypt will issue one to you for free.