Here's what I'm using, keeping it as simple as possible.
This is great for planning out your day to the last detail or for getting a 30,000 view of things. It hooks up to your calendar and has AI built in. What more do you need?
This is a new one I've been trying out, it's a lot like Notion in how it works, but better for collecting and connecting ideas together as a second brain. Its like a mix of Google docs, Notion, and Obsidian.
Both are free to use.
What are you using?