If Biden beats Trump again then I think he has a very good chance of winning the primary and beating Ossoff. In fact, I think that's the best and only particularly good pickup opportunity for Republicans in the Senate in 2026, assuming Kemp is the candidate.
If Trump wins in 2024 then he will not allow Kemp to win the Senate primary. Even if he somehow did, Kemp would lose to Ossoff.
This analysis is probably correct. I think Trump will likely try to sabotage Kemp regardless in the primary, but it’d only be effective if Trump was the sitting President.
Trump's influence actually will decline significantly by 2026 if he loses to Biden again. I doubt he'll even last more than a year or two once he has nothing to live for but lawsuits and criminal investigations.