For 'like-minded people' type of crowd, podcasts and youtube channel work well. Include a message in each of your newsletter for people to forward/share it if t

For 'like-minded people' type of crowd, podcasts and youtube channel work well. Include a message in each of your newsletter for people to forward/share it if they like, be genuine, encourage people to contribute to creating a community, run a 'club' with occasional virtual meetups and gradually increase it if it feels right, make it more personal, open, collaborative.