I have followed the Ahlul Bayt since 2009. However, I took my Shahadah in a Salaf community in 2006. Is it recommended that I reaffirm my Shahadah declaring Ali (a) as the rightful Imam?
When you believed in the fact that Ahlul Bayt (AS) are the real divine leaders of Islam after the Prophet Muhammad (SAWA) and followed them, you don't need to declare that in the form of Shahada. You should be already doing that in Azan أذان and Iqama إقامه.
It is good to say that again if you wish but it is not a condition for being a follower of Ahlul Bayt (AS) as far as you believe in it.
Wassalam.