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Looking at my Goodreads record I see alien invasions are related to less than 25% of my SF reading recently. Higher than I thought it would be but most of these are not straight forward "alien invasions" but are related plots, e.g. James Corey's Leviathan Wakes (and rest of Expanse series), Jason Hough's The Darwin Elevator (and rest of Dire Earth series), and Leonard Richardson's Constellation Games.
I wouldn't say SF is dominated by this theme.
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