What is the best way to renew my sub?

[Jeeqbit]

Thank you, I was able to renew my sub for 10.99

I got 10 Chocobo Silver Feathers, what are thes for?

You can exchange these at a Calamity Salvager for items like level 50, 60 or 70 gear. This helps you get the best item level possible at those levels more quickly. It would be best to spend them on the items that cost the most tomestones, like body/legs or the weapon.

A Calamity Salvager can be found at each of the city states.