The only apple I use is an iphone but I don't use any online apple services or any kind of cloud storage of any company for that matter. Even in my iphone I use yandex mail services and I use the local calendar and notes without sending my stuff over to icloud. I also use spotify instead of apple music. Unfortunately as you say I am forced to use ios and safari but it's not that important.
Regarding degoogling, there are lots of free services that do everything you want. How many free email, calendar and contacts providers are there? You can create a microsoft account and use some of their services too - they provide online office for free, and photo storage as well. No alternative to youtube but you can choose not to sign in when browsing videos and use RSS to subscribe to channels. And so on and so forth. "sign in with google" is an awful idea - if they ban your account you will lose not only your google account but accounts on other services as well.
You have an Android phone and a Chromebook but you can still use these third party services on them.