Convincing someone is an art.
A pretty long while ago, I decided one day to leave WhatsApp.
I told people, I'm just going to use an alternative for now & no WhatsApp, anymore.
All my real family, friends etc. came with me, because they wanted to stay in touch with me. :)
Others, who simply didn't wanna switch were people after all, who I could easily drop, since they apparently weren't that important. :)
So, the remainders stayed on WhatsApp & haven't used it since then. Lost the account access & cannot retrieve it, since it requires a phone number, while my requirement are local backups, which means WhatsApp is doing too bad of a job, fulfilling my requirements. :D
My point is, if you really wanna convince someone, you can't just tell them to do something with your words. Sometimes, you have hard shells to crack, which means you need to do something relatively drastic about it. :)