Your only real options now are Trump, DeSantis, and Haley. DeSantis will likely withdrawal before the New Hampshire primary because he's running out of money and hasn't put much of a ground game together there. That leaves only Trump and Haley. Haley has a chance of winning the New Hampshire primary, where she is polling quite high. If she wins there, even marginally, that will damage the "inevitable" image of Trump and give her momentum into South Carolina, which is her home state. If she were able to pull off a win there as well, that could really turn this into a competitive race.
March 5th, or "Super Tuesday" (which is Utah's caucus day), is the make or break day. If Haley can win a plurality of the states, that'll probably take the primary all the way to the Convention and there's a realistic chance she could win the nomination there, particularly if she were to choose DeSantis as her running mate. If she can't, its over and we can all settle in for four more years of the Biden-Harris debacle. Because lets face it, a vote for Trump in the primary is effectively a vote for Biden in November.