Nim's not Lispy either, and macros alone are not enough. To make macro use feel natural because they're not much different than using the core language, the language needs to be homoiconic, which to my knowledge Nim is not.

In any case, macros are not what draw me to Lisp, but its unparalleled combination of ease of use, readability, and power... along with 70 years of development and tooling.

So I could just use a Lisp or Scheme, which I do. They can be plenty fast too (see Chicken, for instance, which -- like Nim -- compiles down to C).