Have you watched a Trump "speech" in the past few years? It's all incoherent rambling; he's not a unifying figure and never will be so I don't think midterm chances will suddenly go up if he gets on stage and declares victory. The things he's doing domestically are quite unpopular (e.g. killing American citizens with an immigration agency) and there hasn't been real governance -- just illegal tariffs, corrupt pardons, meme coins, attacks on free speech, and a vengeful, politicized DOJ.