I love sci-fi movies!
Here are a few I’d like to recommend:
Interstellar (it’s freaking awesome!)
The Martian (this one’s good too)
Gravity (alright, I’m obsessed with space 
)
Terminator series
Wall-E (it’s an animated movie)
Avengers (all the movies)
Transformers
Jurassic world
Tomorrowland
X-Men series
The Old Guard (2020)
Predator
A Quiet Place
Men in Black
Godzilla
Big Hero 6 (animated movie, love this one)
That’s all I can think of now…