I have worked with a privacy coin before (not going to name them) and I was actually part of the team for a while as well so I know the insides and outs of a privacy coin and how it is perceived by the public and could be helpful in this regard. I would like to start by saying that nobody really cares about extra layers of security and privacy you are providing because for 99% of the population even bitcoin is enough privacy.

For people who are not really interested in something like this, you can't do marketing enough, you can spend millions of dollars into telling people who awesome your privacy is and if they are not interested they will not become interested. Plus, when you are doing a brand new project and the thing you are most talking about is not really that much desired, it will be even harder to get people to use it as well.