There's often specific things that governments can do to ameliorate particular problems. They can cut taxes on fuel, for example, or even provide temporary subsidies, as the British government did to cushion the impact of the rise in LPG prices after Russia invaded Ukraine. These may or may not be good ideas, depending on the circumstances (and they have various consequences, one way or another, some inevitably unwelcome) but they can be done.
Similarly, in the UK, many commentators seem to agree our new Labour government is on the right track in seeking to encourage the building of both affordable housing and renewable power generators by removing a lot of the planning restrictions that had made such developments extremely difficult and expensive.
But the idea that any president can control so massive and chaotic a system as the US economy, let alone that of the world, seems completely fanciful.