Maybe I'm getting old but man, I miss the 90's gaming era ( you can "ok, boomer" me ). Quake, Half Life, Unreal, Hexen, Heretic, Blood... If anyone is interested in a modern 90's style FPS, I recommend you try Dusk.
There is also Doom (2016) which (mostly) honours the simplicity of play found in Doom and Quake, but I found the mostly arena-style action rather dull and repetitive after a while. I missed the tunnels and so on in original games. Personally I'm now into modern games like the Dishonored series or Prey (2017), which a great mix of story, puzzle solving and action.
doom 2016 is a great game but it is fundamentally different from classic doom. the biggest difference being resources earned by glory kills vs resource management coming from level design.