Monsieuridk
you have arrived at the crossroads that so many users get to..
do you leave g**gle , meta, facebook, WA behind or not, its your choice.
Getting people to change to Signal, not going to happen, they need to realise it for themselves, the more you try the less inclined they are to change. You have to see it from their prospective, change to Signal and have you to message or stay with WA and have everyone else to message, their fear of missing out keeps them on WA.