I want to follow this advice but unfortunately whatsapp is the de facto standard in the EU.
I use simpleX and molly with whoever I can but still need whatsapp in order to have any kind of social life.

I don't have any expectation of privacy when using whastapp, same as telegram. I use it to keep tabs of friends and arrange plans.

There's still things you can do to improve privacy on whatsapp:
* Don't have a facebook account
* Don't volunteer any account metadata: name, profile photo, contacts
* Disable chat backups to google drive
* Use a VPN or Orbot
* Never share sensitive data
* Don't allow anyone to add you to large groups without your consent
* Use a no-kyc phone number from silent.link

nostr:nevent1qqspw5nl8k8l9q8qn8ft5aj5eyfeytygnymrxa32yqd68hx47dtlygspz9mhxue69uhkummnw3ezuamfdejj7q3qf6ugxyxkknket3kkdgu4k0fu74vmshawermkj8d06sz6jts9t4ksxpqqqqqqzqckntu