You may be missing the distinction between heat and warming. The geothermal contribution to the Earth's energy budget has not changed (to cause warming) and is negligible to begin with...measured in mW/m². TSI variations (again, they are only changes that apply to warming) have had only a small impact on warming over the duration of the instrumental record with the lead up to the Modern Maximum ~1960. TSI has actually trended lower since the mid 20th century while the most significant warming has taken place.

So, not geothermal. Not the Sun. And there are no other natural factors that have played a role in long-term modern warming. In contrast, we have the known, empirical attenuation of OLR (as per your last reference) resulting from anthropogenically-sourced increases in atmospheric GHGs that explain all of the warming of the last half century. Modern warming has been virtually 100% anthropogenic.