Not only is voting compulsory, it seems to have a lot of benefits. Here's a BBC video on it:

https://www.bbc.com/news/av/world-australia-61186402

Of course there is no chance of us doing this nation-wide, but ... maybe a good idea in the blue states?
As pushback to the GOP trying to restrict voting?

The video is short, but fyi the bullet points for advantages are:

* Moderate contest more likely
* Marginalized people better represented
* More migrant participation

I like the idea because it helps put across the idea that good government is up to you. You can't just ignore it and then complain.