After the midterms, America and its democracy look stronger

Probably. Or at least, inflation will reduce to the expected levels. The more volatile prices (fuel, food) will likely reduce.

As for peace... the US is not itself at war. There are many other wars, most prominently Ukraine/Russia. There is a very good chance that will be over within the next two years, though that is only marginally connected to us.

Tense situations with North Korea, China, Iran, and others have been going on for decades and are unlikely to alter radically in the next few years no matter who is in charge.

Lower crime?

Long term, we already see lower crime. It has dropped a lot since the 1970s. It has ticked up marginally in the last few years, but is still far below where it has been. I don't know if that trend will turn around in the short term.

Less addiction?

Drug overdose deaths have already leveled off. They're still too high.

https://www.cdc.gov/nchs/products/databriefs/db394.htm

How will the national interest be served by voting for the status quo?

It is almost certainly better served by the status quo than by any particular minority view, especially if the view is that of a very small minority. While it's not impossible that there is some radical alteration to the nation that people don't know about, it's more likely that any particular change to the status quo you have in mind is probably opposed by the vast majority of people.

Will we get to the bottom of the number one cause of death?

Heart disease? It doesn't really have a "bottom", since it's a number of different conditions. But we already know that you can improve many of them with a good diet (more foods high in fiber and protein, fewer foods with high concentrations of sugar, salt, and fat, which generally means more whole foods and fewer things that have been highly processed). Radical changes are unlikely in the next two years, and even if there is one, it will have little to do with the political party in charge.