Magnetic pole reversal will pose a big risk for humanity when it happens, that's for certain.

I think we don't have enough data to decide if the sunspots are a sign of an overall hot sun or if they are leading to an overall cooler sun.

tidal forces of the inner planets affect the sun.

I would argue that Jupiter and Saturn also have a similar effect on the sun due to their high mass.

Another consideration is the Earth's precession which has been attributed to the greening and desertifying the Sahara.

That sounds rather like people who don't want to take responsibility towards our planet. Precession is just the effect that is holding earth's axis steady, leading to seasons.
Desertification is most likely created because of extensive agriculture which removes local plants, that keep desertification from happening, and replaces them by a monoculture of some profitable plant.