I find the argument from first cause, contingency, and actualization to be emboldened by the very compelling thought experiment known as the Grim Reaper Paradox. For those unaware, Alexander Pruss and others developed this paradox to show that an infinite regress is impossible. I will link his explanation to the paradox here: https://alexanderpruss.blogspot.com/2008/01/grim-reaper-paradox.html
I have only heard one objection to this paradox, which seems weak. The person is being killed by the collection of reapers. This objection is weak to me for several reasons that I won't get into here.
My question is this: are there any other good objections or do non-proponents of causal finitism need to bite the bullet and drop their beliefs?