The thing is that conservatism wins when it’s tried. Not narrow focused. All on the table - reducing (WAY reducing) the tentacles of the power mad government, lowering taxes, strong military and border defense, protection of the unborn and helpless, and no catering to deviancy or support of leftist social causes.
Leave any of it out, and there will be less support.
You’re not leaving it out, you’re picking what the key thing about the choice is. Either you do it or your opponent does it for you. If you emphasize everything, nothing is emphasized.
The Contract with America, Morning in America - these clearly defined the election and the choice into something of utmost importance to a landslide majority of voters.