I just started caring about my own privacy. What apps should i get rid of, why and what can i replace it with?

Adding to what others here have already said, I'd definitely download Signal and see if you can get any people to move from WhatsApp/Telegram/whatever to Signal.

I don't know much about iOS apps, but you could look into more privacy focused YouTube clients, and possibly 2FA clients too (although that's a bit of a controversial topic on iOS AFAIK).

I saw you mention in another comment that you use Amazon Alexa for smart home appliances. Depending on interest in selfhosting / time / motivation to move away from Amazon, you could look into using Home Assistant instead. It even has a Lemmy community: !homeassistant@lemmy.world.