Everybody has their off moments, but I’d say the top drivers strategize pretty heavily (even if your only counting pit strategy as strategy). Even then I’d say driver called pit strategies have about as much chance of working out as team strategies (which are mostly guess work). The only strategy the driver can’t really contribute to is the mechanical preservation strategy, because they can’t see nearly as well what the condition of their engine is. But even then, that strategy is the same all the time - make the engine and gearbox last the required number of races.