Seeing as how Ambuscade is the main content that gets updates every month and I'm seeing a lot of people around with +2 gear for a lot of things maybe it's time for new sets to be introduced.

It could still be kept where sets for hallmarks and gallantry are swapped each month but have 2/3 choices of armor instead of just 1 set each/ (Nyzul and Salvage)

There is still a lot of content where they could reuse assest to make it easier too.

Perle,Teal/Aurore sets from Abyssea, Yigit/Amir/Pahluwan from Assault, and Campaign armor sets. There are so many options that can be picked from! (Many more than those few listed)

People are still doing ambuscade all the time and seeing as how it resets every month this could give people a few more months of chasing the shiny new gear.

Also, why not add some weapons to the mix? They don't have to be top tier (nor should they for "casual" battle content) but maybe as a stepping stone for people that don't want to spend so much money on random augments but can't get groups for escha NMs.

Ambuscade is fun and constantly fresh content but the rewards are a bit stale as they don't really change. A breath of fresh air and new things to chase might help the grind feeling a lot of people experience too.