Crime is not a good thing to work on. It shot up under Trump after declining markedly under Obama:
The violent crime rate fell nearly 16% from 2008, before Biden’s vice presidency, to 2016, his last full year as vice president. A crime analyst found that in some cities, the total number of murders has gone up at least 26% in 2020 compared to the same timeframe in 2019 (experts said the crime rate likely would also be up about 26%).
Fact check: Biden says crime fell under Obama, rose under Trump :: WRAL.com
Not that it's all Trump's fault; presidents don't really affect crime rates as much as people think.
As inflation goes down, that isn't going to be a big thing, either. It looks like the stolen classified documents issue is going to be a big thing as is increasing republican calls to defund the FBI (which runs down terrorist threats, human trafficking and the like). I don't think most Americans are going to like that idea.
All this stuff is what's fueling the increase in the public's rising regard for democrats and falling regard for republicans. Incredibly, it looks like the democrats might actually gain seats in the Senate, and it doesn't look like the usual mid-term blowout for the House at this point.
As you suggest, the republicans can still turn this around by finding issues the public cares about. But it needs to happen soon.