I'm honestly still new to the whole Twitter thing in general, but I'm trying out a few things.
1) If Lara trusted the Coalition, she’d work for them as a pilot flying the void between the worlds. She’d know what to think when they tell her a captain went rogue + killed the other pilots. But if Lara doesn’t fight with them, the captain might end the worlds.
2) Lara pilots her airship through the void between the worlds, scavenges in ancient ruins for lost artifacts, and always sticks her neck out for her tight-knit crew. Now she has to chase a military renegade through the void to prevent society’s destruction.
3) Lara Kavarin flies her ship through the void between the worlds, seeking lost treasures. Amerlaine Silver wants to unleash the horrors of the void to destroy society. Outmatched, Lara must stop her, or else the worlds will become a living nightmare.
Here you go! Just slight rewrites for smoother sentences mostly.
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#5 A treasure-seeking pilot takes a job hunting a rogue military captain through the void between worlds. To succeed, she must escape time loops & infiltrate the enemy base before the void's monsters are unleashed on the worlds.
#6 Steampunk meets space opera when Lara, the captain of a worlds-traversing airship, takes a job to battle a military renegade who's planning to unleash the creatures of the void between worlds. Time loops and [the world's best/a state-of-the-art] warship stand in her way.
#7 In search of lost treasures, Lara Kavarin flies her airship through the void between worlds... a place filled with horrors that Amerlaine Silver wants to set loose on society. To stop her, Lara must give chase across the void, through time loops, and into Silver’s high-tech base. [can cut last names if you need more space]
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My only nitpick is that Lara's emotional journey/character arc does not appear here. However, with all the rest you have going on, it might be better not to shoehorn that in too. Well done overall, and I'm guessing you'd draw interest even with no changes at all!