Have you tried SwiftKey?
And here's a list of all available keyboards if you haven't tried them already - https://goo.gl/313NZc
Thanks bro.
Just tried swiftkey, the global key is still within the keyboard not below (like the original apple keyboard).
Then suddenly realized that cuz I am using X and the keyboard is for majority of other iphone users. Thus, the keyboard have to include the global key within it.
Hopefully, there will have updates that using X can choose to press global key below the keyboard. I prefer a bigger "123" key.

