What do I do if I make a mistake in my Notion Planner?
- Try clicking command/cntrl Z
- Or select the 3 dots in the top right corner and click Undo

What do I do if I accidentally deleted a page in my Notion planner?
- Try clicking command/cntrl Z
- If it's too late to undo your mistake, check the 'Trash' section in the left Sidebar of your Notion
- If you see your deleted item, click the Restore arrow

I'm seeing a message saying I have used all the blocks available on Free Notion and need to upgrade

This means you are using the free trial for teams, not the free version of Notion. You can change the plan you are on by contacting Notion Support

For more Notion support, please head to this link which provides more information about the platform.