What packages or custom items should i run?

First i've got a linksys wrt1900acs model a00
i guessed that was version 1 so i installed this
seems to be working fine

Never using this before, i'm not sure what if anything i should add in order to have the best all around functionality and security.
I mainly updated because i wanted to see my DB on my wifi to configure the best quality to the desktop..
Sadly i'm unable to use ethernet as the best signal i get to the modem is outside of this room.

anyways, any packages or other things you'd recommend i install, things i should configure differently, or even things to improve the performance?

SQM is almost always useful.

What type and speed is your Internet service?

120/3, it's cable and the max our area can get.