F# is a great language, but so is C#. MS has done a really great job evolving C# away from a Java clone. C# keeps adding features inspired by functional languages, narrowing the gap to F#. Of course this makes it easier to switch, but on the other hand it also makes it less interesting.
When F# first dropped, I was instantly in love. It was just so much nicer than C#, which was already nice. But, in the intervening years, C# has been adding new features at such a steady clip that it's hard for me to have such strong feelings anymore. Stylistically I like to have algebraic types and pattern matching, but from a practical perspective I think the two languages probably offer about the same level of productivity.
Kotlin has been treated as a first class citizen in the official Android IDE and one of the major Java IDEs in a way that no other language but Java itself is.
The familiarity of C-style syntax and object orientation immediately places Kotlin above ML-style programming languages from the standpoint of adoption. It's a bit unfortunate that this is the case, but selling Android developers on a better C-style OO language than Java is a lot easier than selling them on something different.
But I think Clojure isn't in a terrible spot right now. It gets a modest amount of use. More than I think many people imagined it possibly could have.
React Native works well enough for a lot of apps out there, and makes it relatively easy to write cross-platform apps. So, it's a pretty good platform to build on in my opinion.
They haven't yet bothered to make .NET Native understand the MSIL bytecodes required by F#, for example.
i see more books and open source projects for F# than kotlin, which for a while made me skeptical about the truth of kotlin popularity
F# has been around a long time and while it's experiencing modest growth and I think it has a positive track, I've certainly never seen it hyped and on the tip of every tongue the way Kotlin now is within the Android space.
that being said, for an outsider (i mainly do BI and DB stuff), it seem like xamarin (C# and F#), flutter (Dart), react native (reasonml) .. might seem like the options to investigate first nowadays
i think outside of android development, kotlin .. is not hyped at all
Heck even PowerShell now has a WinForms designer.
F# was always linux friendly, long before .net core
People are going TO Kotlin as opposed to the usually Ocaml/F#/Haskell/Idris/Agda world of the community trying to bring people in.