But, similar to the author, I'm having more difficulty getting rid of WhatsApp. This is my primary means of communicating with friends and family all over the world. And for some of them I know it's just not an option to try get them to switch to another platform, especially since I'm not sure which is the better platform. In my opinion, WhatsApp strikes the perfect balance of security and usability. Telegram makes me nervous due to the Russian roots and the numerous security concerns I've read online. Signal is overly secure to the point that usability for regular folk suffers (I've personally had terrible experience with their support after losing a bunch of SMS messages.) Matrix, Riot, MatterMost, and many other opensource apps all look good but not overly user-friendly for novices.
What else is there?