Robert Blake was one of the few humans who found out about a small part of the truth regarding the universe and Nyarhalotep(Nia from the secretary from the manhwa).His mind began to slowly deteriorate. He was the first human to ever pray to Azathoth. He begged him to spare him but yeah, he just perished in the end. (some are my interpretations but the basic mention is accurate).
In a way, the only way mc can escape from him (since killing herself is pointless because he can just bring her back), is to truly find out the truth about the universe and who Azathoth's role really is, which will let her get erased from existence as she will be defying the laws of the universe. However, considering Azathoth manages to control her in the end, making her stay forever with him in complete ignorance, she'll never be able to achieve that as long as he's interested in her.
Her plan B would be to wait until he wakes up, because if Azathoth wakes up, the whole world will stop existing, getting lost in the void. And he'll also mindlessly forget all he has chaotically generated through his dreams, including her. This will take A WHILE lmao
Her plan c would be to make him lose interest in her, which is fat chance lol
Another fan fact is that saying Azathoth has no true form isn't completely true. He does have one ultimate form, which is beyond human comprehension. It's basically his eldritch, sleeping body which no being in existence, Gods or humans will ever be able to gaze upon, as it is in a 'spiritual'(not exactly the correct word, but i'm trying really hard to make it comprehensible) plane above everything in existence. It would like a "thought" attempting to notice the human who has generated it. That's why, the countless forms we see, are all projections in his "dreams", and his dreams are our plane of existence.