CO2 IS the most important greenhouse gas
I've heard scientists say CO2 is the big control knob on climate.
Water vapor is an important greenhouse gas and it does cause more greenhouse warming than CO2 but it's not something we can control. Over 70% of the Earth's surface is covered by oceans that freely evaporate water into the air controlled primarily by temperature. Since water vapor is controlled by temperature it can not drive temperature.
Of the other greenhouse gases you mention it's true that many of them are more effective greenhouse gases than CO2 but their concentration in the atmosphere is so low compared to CO2 that they can almost be ignored with the possible exception of methane. And even methane oxidizes to CO2 and water vapor within 10-20 years so it the long run it's just more CO2.
CO2 more than any other greenhouse gas is the primary controller of Earthly temperatures (after accounting for solar input).
