This might get some hate and controversy among the die hard classic fans who disagree with adding anything new that wasn’t in the respected expansion.
But, i was thinking of how to make this cool and beautiful city/zone not so dead and unpopulated because of the lack of a few things as far as i know. One of the first suggestions i have would be to add in a barber shop. I always found it weird how this glorious capital city lacks a simple barber shop where Orgrimaar and even The Undercity has one. I feel this would be the first step in at least giving Silvermoon some much needed love and attention, and having something so small yet useful can go a long way to seeing more players have reason to be here outside starting out.
My second albeit most controversial suggestion out of all of them i think would be to add in a Transmog Station like the way Orgrimaar has. I know Tmog stations are locked into their respective faction city Capitals but if Blizzard decides somehow allow this then i am all for it. I honestly doubt they will but i just wanted to throw my 2 cents out there anyways.
My last suggestion would be to add or allow the Flight master to travel across the entire Easter Kingdoms. It does make sense that their respected Dragonhawks are only allowed to travel within the Blood Elf starting zones for reasons but if a new FP could be added that would allow players to travel more easily to and from Silvermoon, i feel would really help with adding more player traffic to the city.
TLDR;
Add a Barber Shop
Add a Transmog Station
Add a Flight Path that allows you to come and go in Silvermoon City