There are strategies that have been developed to address symptoms related to brain injury based in cognitive rehabilitation procedures, medications, and many others. These approaches have been helpful in varying degrees in remediating symptoms. However, it is common to hear that one can expect little improvement after a year and a half. Neurofeedback has been found to be helpful with a number of symptoms related to TBI whether right after injury, or several years later as suggested in the quote above from an overview of the topic by Cory Hammond, Ph.D.
The article is in our Research Section.

A survey of research addressing neurofeedback with stroke is also included in the research section. It is better at outlining the many difficulties in interpreting this kind of research. Both surveys indicate that more controlled studies need to be done to establish neurofeedback as fully efficacious. At the same time, the stroke survey concedes that “The majority of individuals included in the assessed studies demonstrated improvements in their respective pre-post NFT outcome measures. Following NFT, participants noted improvements to memory, mood, concentration, energy, reading and speech abilities and motivation.