Not voting + protest, pressure is the only available tactic . In 1997 people voted, but they (islamists) didnt listen, didnt change. 20 years further call for reforms didnt change anything, nothing changed, it worsened. So these fake elections wont change anything. This course will eventually lead to (violent) clashes between them (islamists) and nationalists, democrats.
Stubborn Saddam, Khadafi, assad made the same mistakes and ended up being hanged, stabbed in *** and being shot, humiated before camera and countries destroyed. The islamists want to lead Iran towards destruction, because they imagine a never ending rule, not knowing that even mongols didnt last forever in Iran.
The state companies, bonyads, corruption, low oil prices will become a burden for them which eventually will even set their own supporters (not more than 20% of Iran) against them. Add to that the evolution of Iranian peoples thinking, ideology will become fatal for them.