What does it actually mean to "focus on affordability?" Trump constantly jawbones the Fed Chair to reduce interest rates (to the criticism of the media/Dems). He's replacing the Fed Chair with Kevin Warsh - who will reduce rates. That would probably be the most effective way to further reduce inflation. His policies already have energy prices down. Trump is trying to cut the size of government which is opposed by Dems and liberal interest groups. The BBB reduced taxes on working people (no tax on tips) and otherwise extended the Trump 1.0 tax cuts.
Housing is too high, particularly in urban/suburban areas. What can a President do? In general, he's trying to reduce/eliminate onerous environmental regulations, which should help.