You know: this always tempts me, but I hold back because nim is not memory-safe (or has a clearly delineated memory-safe subset like Rust), and I would rather pick up an actually memory-safe (even if GCed) language even if some perf-cost (like F#, Ocaml, Swift, Vale ..etc).
There is a fairly clear subset of Nim which is memory safe. There are discussions once in a while to reduce that from a small set to one..two keywords, e.g.:
https://forum.nim-lang.org/t/9280#61243
which has links to some others. The resolution is usually: Eh - it's already a very small set.
There also may well be libs (that you feel unable to not rely upon) which use these language constructs, and trust sure is tricky (in any PL ecosystem as well as just in life).