You can make your own private ecosystem of online services very easily, even if you're non-technical, using @nextcloud. It's most famous for file storage, but it also includes lots of add-ons and apps such as collaborative office software, messengers, calendars, contacts etc.

It's well-suited to groups, organisations and anyone who wants to get away from Google. There's a beginner's guide to getting started at:

➡️ https://growyourown.services/beginners-guide-to-nextcloud

You can browse the add-ons at https://apps.nextcloud.com