Focus and attention are skills that you can learn or improve upon. For my hearing-impaired child, he initially had trouble focusing in group situations, when it was noisy. Over time, that has gotten much better.
We have done private weekly piano lessons for 3 years now- I think music is a great way to learn focus and persistence. Sports can be a great way too, if they are engaged in it. My kids play alone or together with Legos for hours, making up imaginary battle scenes, etc.