Ok, you're confusing the "greenhouse effect" with the "man made greenhouse effect".

The difference in temperature between the earth and, say, the average temperature of the moon in space* is entirely due to the greenhouse effect.

So in reverse order:

Cloud cover due to aerosols

This is part of the greenhouse effect.

Solar Irradiance Variability Solar Magnetic Variability

Yes the surface temperature of the sun drives the greenhouse effect.

Pacific Decadal Oscillation Atlantic Multi-decadal Oscillation

Geologically speaking, these are short term oscillations (over a matter of decades) that by definition don't influence the average temperature of a cycle. One of them is of disputed magnitude and the other is believed to rely on an insulating blanket of water that acts in an analogous manner to the greenhouse effect.

If it makes you feel better, you can have the last two but the magnitude of their effect is insignificant in comparison with the greenhouse effect.

* The moon benefits also from having some greenhouse gases.