There is much in this account that suggests it is part of the Yahweh vs. Baal narrative that began with Gideon.
Gideon appears in Judges 9:1–57 only as “Jerubbaal”: Judges 9:1, Judges 9:2, Judges 9:5 (x2), Judges 9:16, Judges 9:19, Judges 9:24, Judges 9:28, Judges 9:57.
Though Abimelech is the son of Jerubbaal (Judges 9:1), he allies himself with the Shechemites:
I am your bone and flesh
(Judges 9:2), he says to thebaals
(leaders
= ba‘alim, Judges 9:2–3 [2x], Judges 9:6–7 [2x], Judges 9:18, Judges 9:20 [2x], Judges 9:23 [2x], Judges 9:24–26 [3x], Judges 9:39, Judges 9:46, Judges 9:47, Judges 9:51). They refer to Abimelech asour brother
(Judges 9:3).1
1 Now Abimelech the son of Jerubbaal went to Shechem to his mother’s relatives and said to them and to the whole clan of his mother’s family,