I think it will play a role in the upcoming Avengers movies and possibly Season Two of Loki. Not sure exactly what role it will play quite yet, but I'm sure it will be involved in the upcoming Multiversal War.

I picture Alioth as being one of the two secondary antagonists of Loki S2 (alongside Ravonna Renslayer) with a Kang variant (possibly Victor Timely or another Kang) as the main antagonist.

Maybe Alioth eventually turns on the Kang variant and kills him.

It’ll probably be forgotten

His powers are too arcane and OP. He was a plot device in Loki season 1. I doubt we'll ever see him again.

It will be what destroys the multiverse at the end of Avengers: Secret Wars

Maybe in Loki - Season 2.

I think we will see Alioth again. Loki Season 2 seems like a good fit. There are other Loki variants hiding out over there, so we might know more about their fate and Alioth’s in the future. He might be a powerful entity that other Kang variants might want to control. Since he is all CGI, not like you have to work around an actor’s schedule to bring him back.

If Deadpool does enter the TVA (Which is probably most likely gonna happen), he might get pruned for his behavior and trying to escape Alioth would be a little too easy for him. It might also prove that Deadpool was the 2nd to 3rd person who might've caused the Multiversal War