Muharram is month of Martyrdom of Imam Hussain as.And all Shia Muslim conduct mourning ritulas during Mohharram.
Should there be any change how to mourn that It will be more acceptable to common masses and also highlight the the massage of Imam Hussain so that we achieve the goal that is edtablishment of Islamic governance .
H 483, Ch. 10, h 2 (Alkafi, Vol 1, Part 4)
Ali ibn Ibrahim has narrated from his father from Muhammad ibn abu ‘Umayr from ibn ’Udhayna from Buray al-‘Ijli from Ima abu Ja'far ((عليه السلام).) who has said the following about the words of Allah.
"(Muhammad), you are only a Warner. For every nation there is a guide. (13:7)" The Imam (a. s.) said that at all times there is a guide from us who guides people to the teachings of the Holy Prophet (s.a.) Of the guides who possess Divine authority after the holy Prophet (s.a.) is Amir al-Mu’minin ((عليه السلام).) and his successors one after the other."
Grading Majlisi Hasan
Imam Ali (عليه السلام) did not relinquished his duties as Imam because Imamah is independent from non divine election process.
Since people Madina already went their way to select the leadership for themselves, so Imam Ali (عليه السلام) will not waste his time and efforts to change the people election. Because, to change the decision by Muhajirun and Ansars would mean a bloody war. Not putting that option...means (put a curtain or I termed it as temporary sheild).
But that curtain was lifted when he was forced to be the 4th Caliph. So he fought all the enemies of Islam who was not following his leadership.
So timing and patience were important...