I find that most SciFi, especially action oriented ones, lack a compelling, interesting antagonist. The writer gets so lost in trying to explore this world they’ve created that they just throw in a mustache-twirling bad guy or gal for the protagonist to defeat.
Like Foxtrot mentioned, what is the antagonist’s goal? What is motivating them? How do they challenge the protagonist? Is there a main antagonist, a Darth Vader to this group, someone who leads or whoever is the most compelling? Perhaps it’s someone the protagonist knows.
Something I do is to make a logline from the perspective of the antagonist. Or at least I write down their goal and think through the motivation. The audience doesn’t need to agree with what the antagonist(or protagonist for that matter) is doing, but they should understand?why.
Here’s an example using some elements from your concept but making up my own story:?After discovering a secret society of astral projecting terrorists, a humble cop trapped in the astral plane must learn to affect the physical world so he can prevent their next attack. (31)

I tried to include my suggestions. I hope this helps.