The common factor seems to be more grounded Earth-based sci-fi with a smidge of horror and perhaps some mystery, rather than space battles.
In that case, films and TV:
- Early Cronenberg up to eXistenZ (perhaps Crimes of the Future, if you really like that)
- Society
- The Faculty
- Save the Green Planet
- Under the Skin
- They Live
- The Mist
- A Quiet Place
- Cube series
- Slither
- Splice
- Splinter
- The Reanimator series
- From Beyond
- Phantasm series
- Tetsuo
- Cloverfield (and 10 Cloverfield Lane)
- The Host
- Predator series
- The Void
- Fringe TV series, as you liked The X-Files. I presume you have watched Millennium?
- BrainDead (2016 TV series)
- The Suicide Squad and Peacemaker TV series
- Truthseekers (2020 TV series)
- Lovecraft Country - book and series
- Eerie Indiana
- Ultraviolet (1998 UK TV series)
- Tokyo Gore Police and others by the same team, like Meatball Machine and Machine Girl
- Gantz
- The Girl With All the Gifts - book and series
- Timecrimes
- Pi
- Bad Taste
- Grabbers
- Body Melt
- Wild Zero
- Pontypool
- The Objective
- District 9
- Firebase and have a look at the others they have done, especially Zygote
- Love, Death and Robots
- Matango
- Xtro
- John Dies at the End - read the books first
- Frankenstein's Army
- Overlord
- Quatermass and the Pit, as well as other Quatermass films and series
- The Deadly Spawn
- The Man With X-ray Eyes
- Village of the Damned (1960)
- The Illustrated Man (1969)
- Take Shelter
And one with spaceships in it: Starship Troopers