Yeah, it’s about finding the right balance for oneself. I know WhatsApp is very much needed many places, in the same way Facebook Messenger still is here (but to a much lesser degree than before, so there’s hope!). Discord I also have, and will keep, but if I find communities I’m looking for on Matrix instead, I rather go there first. Amazon does not really work well in my country, so that is not a big deal to delete.
Regarding e-mails: to prevent lock-in, I set up custom domains that I use with Proton, that I can easily migrate to another service provider if needed in the future. I have one for personal communications, and use a mixture of catch-all aliases and SimpleLogin for new signups and accounts I want to keep. I also have one domain for semi-anonymous accounts more associated with my “online personas” than my real identity. This fits my threat level nicely.
I have also rid myself of streaming accounts now (last one is heading towards expiration within a couple of weeks). But instead of not consuming any media, I must admit I have taken to piracy again. The goal is to be a lot more conscious about the content I consume - too much time has been spent on mindless browsing for something to watch on Netflix and garbage movies / shows. Now I host Jellyfin locally, and I control exactly what content is there in the first place.
As to your last paragraph, I did not really understand what you are asking about?