Ok then, well, we have time. We just need to figure this out and get everyone mobilized.
C2, if you are reading this, here's a note. Egyptians had a large focus on balance. If Apophis rises, we need an equally strong force of order and good, such as Ra, to rise as well.
Hold on, Apophis is said that be so powerful that even Ra always needs help to bring him down. Now we, a handful of demigods belonging to a foreign god, could do what we can to aid him. Of course, even we may not be enough, giving however relatively recently we'd emerged after Sind left the world.
However, there is a much more powerful group of people who'd been here the longest and host the biggest political entity in the world: the Cisharni and their Atlantean minions. If what Serena says is true then the Cisharni really hate the Pharaoh. If we were to drop hints that he's willing to go full-blown Femto on everyone just to feed his colossal pride at controlling a snake-like eldritch abomination who will no doubt eat him first and then the entire world, then they will do everything they can to stop him. They'll swoop in to kill or apprehend him, doubtlessly losing most of their strongest members in the progress, then (hopefully) have to fight a brutal civil war with his supporters and heirs (if they're just as hated) that will cripple the Atlantean Empire from the inside. Meanwhile, we Sindari and our human
minions allies will make the civil war last longer grow worse until their 'new world order' crumbles, then swoop in to pick up the pieces. This is the best case scenario.
Worst case scenario; however, the Cisharni become too reluctant to strike down the Pharaoh in time and we are forced to fight side by side with our hated enemies to take down Apophis. If we survive the battle, they will inevitably turn on us and most of us will die while the rest change their forms and go into hiding. The Pharaoh will either live to fuck us over yet again or get executed. What's left of his supporters; however, having experienced firsthand how expendable their liege really considered them, will defect to the new Pharaoh (who will probably be the Inquisitor or someone far worse). Doing what Archaementes would do in his position if he was a Cisharni, the new Pharaoh will spin tales of the struggle against Apophis to the masses, ultimately blaming the Sindari for the incident. The entire world (the still intact parts of it, of course) will hate our guts, we will find it much harder to infiltrate their societies and to do stuff, and the Cisharni will be sitting pretty.
Yup, this can swing both ways.