Here goes...
Like I said before, I selected Optional Voting as it is right now in the US,
But i think, it should be in everyone's interest to vote and to take advantage of their privileges as a citizen to vote for something you participate in or benefit from, and it should be your responsibility to educate yourself to vote for what you believe, and not just blindly vote...
The state or government can benefit from a 100% participation rate...., because the voice of the population is fully communicated and the true choice of the people can be represented by the action of the true majority.
All voices heard and no one can complain that their voices were not heard.
How to effectively incentivize or encourage or enforce it you ask?
A) Monetary or financial burden? Maybe... Increasing due with each successive miss or non participating.
B) Jail time ? No, I don't think we need to go that far
C) Disqualification from government benefits, similar to or like access to libraries (inability to check out books or materials)
D) Inability to buy houses unless you pay your dues, which are quadruple or tenfold the amount originally due above.
E) Or any other administrative process would be hindered by your choice to not vote....
Make it just annoying enough that they will see how much simpler their lives would be if they just taken the time to vote....