Be the change you wanna see in the world. Start by ditching WhatsApp yourself, or at least aggressively reducing your usage of it in favor of Signal. Let your friends and family know that you’re only reachable on Signal now and see what happens. You don’t have to ask them to switch; just to use Signal if they wanna contact you.
You better believe that any metadata that can be syphoned by Meta is, that includes profile info, social graphs, who’s calling/messaging who, when, and for how long. AFAIK only message content is e2ee.