Although in principle, once one has reincarnated using the Heavenly Demon Secret Technique, one should avoid unnecessary trouble and refrain from provoking beings whose strength far surpasses that of the reincarnated body. It's best to keep a low profile and endure if possible.
Especially when choosing to reincarnate as a deity in the world, it's best not to conflict with such beings unless necessary.
A deity's combat power depends on their divine office and Divine Power Level. Most divine beings' offices are basically unrelated to battle, with a few in charge of war, slaughter, justice, and light having astonishingly powerful combat capabilities, placing them at the very top amongst their peers.
In this regard, Epics are quite different from deities. Epics are not bound by divine offices, and because they need to wander in the Void for long periods, they must have the ability to defend themselves.