As I understand it very few PCS cases end up being permenant, the vast majority get back to feeling absolutely normal - though there does seem to be a permanent susceptibility ie once you have had a concussion you will get another more easily so you should do everything you can to cut out any more impacts.

I've recently had a medical report which expects me to make a full recovery, but potentially not until the 2 year mark, so there's no reason the improvements you've noticed shouldn't continue. Just make sure your brain gets to rest when it needs to. Plenty of other good advice for recovery strategies on this forum.

All the best.