Ich aftermath... what to do now?

[SharkBait48]

Hey guys so I went through ich it killed over half my population...
nut now I am looking into the tank lately and the remainder of the fish seem like they are happy and healthy.
it has been about a week since any noticeable spots have been on the fish.

my question is now how long do I have to wait or what do I need to do to repopulate and make a healthier tank than before?

thanks