I consider a full recovery from TBI/PCS to be when you understand how to play the cards you were dealt, your coping skills will get better, you threshold of headache pain will improve, you learn ways to trigger your memory easier, you'll accept that you are no longer the old you, that's when you're 100% again, its 100% a different you though. Not sure the extent of your symptoms but I'm 7yrs 1mo into my severe TBI and I still have many problems (memory, anxiety, ADD, 10-15 day/mo headaches, sleeping for 24hrs straight, not sleeping for 4 days straight, depression, the list goes on) you learn to adapt honestly. The worst one are the headaches, I hope the best for you with those. You will improve greatly over time but never think you are cured or in the clear, there's always the chance of set backs and when they come they seem to hit fast and hard, not to be a buzz-kill about it but you should know it is a possibility. The first time I had a relapse in symptoms I completely broke down mentally and emotionally, I couldn't believe after all the work, doctors, meds, effort i put in I felt as bad as I did in the beginning its devastating especially if you don't know that it can happen at any point. Again I don't know about your injury, your symptoms or severity but that's my personal experience with my head injury (i was a 6 or 7 on the Glasgow Coma Scale)
I hope the best for you on your journey! Good luck with your symptoms, if they persist look on this site for ways to reduce/ deal with them. I find the community of TBI/PCS people who've been dealing with the same issues more helpful than doctors these days