Regarding why the Avos were not made into angels like Matatron (Chanoch) and Eliahu
-The Avos were bigger then Chanoch and Eliahu, why didn’t they merit to become angels after their death?
-Know that big tzadikim (holy sages) are bigger then angels.
-Their souls come from a higher source and they reach much higher levels.
-They become channels for all the worlds energy, while angels just distribute the energy.
-The Avos reached these levels. To become angles would have actually lowered them from their current state.
(Medrish Talpyot, branch of Avos)