Usually when you increase disk space using AWS dashboard you're not going to see that new space ondf -h. So you need to ask to machine extend your current disk to a new free space. Here's how to do it:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html

After that command lines I did restart EC2 and then I was able to see the new space at my current disk in EC2.